(Question) NFC Transmission Distance - NFC Hacking

Really sorry if this post offends anyone. I have checked this section of the forum plus google search to answer my query without any luck.
My question is: Is there any way to extend the NFC Transmission Range? I have recently bought a battery case for my HTC One X and it adds half a centimeter to the phone which NFC can't transmit through (I understand this could be interference with battery if the battery if located behind NFC Sensor. I only need an extra centimeter (maybe even half a centimeter. I've looked in app market and can't find any NFC signal/transmission/booster app. Don't even know if possible. But just thought I would ask my good friends at XDA. If not no big loss.
Thanks

As far as I'm aware, there would be no way to extend the range other than adding your own antenna extension. This would obviously require taking apart your One X.

OK, thank you very much for your answer.
Sent from my Nexus 7 using Tapatalk 2

Why would this offend someone? j/c
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

The battery case (which has metal in it) is likely acting as a shield.
NFC transmission distance is highly variable. When reading smartcards it's only a centimeter or so. When in card emulation mode it depends on the reader - most payment terminals only have 1-2cm range. However, a larger reader (such as the ones at the gates where I work) have 1-2 foot range.

I thought that it could be because of the battery but wasn't completely sure. Great piece of information though. Thanks
@Irish.iolar I'm pretty clued up with many things technology wise, but there are still millions if not billions of things I'm either totally clueless about or unsure off. And everything I have learned has been through reading, searching (self-taught) or thanks to the great people on this forum. I have tried searching the usual places for this bit of information and was surprised to find so little on it to be honest. The reason I usual start when asking such a question like the one in this topic is because I have seen countless people being flamed etc for similar questions. And I'm not talking about "billy" I no nothing about tech but got my new device and I'm gonna just ask something we deem silly. I'm talking about other guy/gals with some experience getting slammed. "But if you don't ask?"
I would have thought the top of the phone would have been a better place for the NFC chip but maybe space re-straights. Will just have to take phone out of case when I need to NFC something.
Thanks for all your help and useful comments.
Your friendly XDA member.
Phil

On the HTC One X, where are the antennas? Are they built into the battery, the phone, or the back phone cover? On my Nexus S, they're in the phone's back cover. If you buy an extended battery for the Nexus S, you have to make sure the battery cover has NFC antennas, or your range is really, really bad.

You can use nfc on the screen side of the phone

Related

2 weeks and is broken!

2 weeks and is broken!
I had this thing for not more that 2 weeks and the speaker is broken
T-mobile is sending replacement tomorrow, but this is disappointing from HTC
Only this time i will put screen protector from day one.... the screen is not exactly scratch resistant.
If we add the battery performance andddd this is not exactly Desire
How'd you break it?
I work in mobile sales and deal with people like you on a daily basis, "i've only had it 2 weeks and its all scratched/part A broken/ its really slow/ battery life rubbish" I have had my desire for nearly 2 months with no scratches, the screen is as scratch resistant as most touch devices - as in don't stick it somewhere its gonna get scratched- pockets with keys - and you'll be fine. Try and remember how much these devices cost and treat them with respect. If your unfamiliar with Android/smartphones/computers then don't complain if it doesn't work as you'd expect as you have no knowledge or experience to base it on and have more than likely done something wrong, lastly battery life on all touch devices is poor when compared to older mobiles - WE ALL KNOW THIS BY NOW!! - learn how to use power management features and apps such as juice defender, be aware that lithium ion battery life will improve within the first month if used properly and finally if you don't know these things then USE GOOGLE FFS!! This is a forum for android general discussions not to pointlessly whine when you can't look after your own phone! END OF RANT
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Sent via the XDA Tapatalk App
It's all scratched up and broken after only two weeks? Unless you work in construction or something you REALLY need to learn how to treat your devices or stick to something more play school. It's an expensive high tech device, it's not a rubber coated brick. It's a small computer with a 3.7 inch GLASS screen... learn how to treat it.
CarpeDiemsNuts said:
Try and remember how much these devices cost and treat them with respect.
Click to expand...
Click to collapse
This.
People are the same with laptops.. just because its portable it doesn't mean its not a fragile bit of modern tech.
Did I miss something in HTC's advertising? Where does it say its scratch resistant?
And you have had it 2 weeks, the battery should only just be starting to reach its peak performance.
I don't wish to appear cynical but all your statements point to the fact that you don't look after your phone and have limited knowledge about it, I'm not surprised your speaker has broken. Count yourself really lucky HTC are giving you a second chance.
Lol.. lucky their speaker broke, that sounds like a genuine fault.
I have to admit I think the speaker is of bad quality. Bloody built in obsolescence imo
Lucky you are getting a replacement.
Mine has dust under the screen, this is not something I could have done myself, not that amount of dust in that specific place after 2 weeks (I've had the phone longer but it's been there for 2 weeks).
T-Mobile wont do anything, even though the Nexus One has the same issue.
CarpeDiemsNuts said:
I work in mobile sales and deal with people like you on a daily basis, "i've only had it 2 weeks and its all scratched/part A broken/ its really slow/ battery life rubbish" I have had my desire for nearly 2 months with no scratches, the screen is as scratch resistant as most touch devices - as in don't stick it somewhere its gonna get scratched- pockets with keys - and you'll be fine. Try and remember how much these devices cost and treat them with respect. If your unfamiliar with Android/smartphones/computers then don't complain if it doesn't work as you'd expect as you have no knowledge or experience to base it on and have more than likely done something wrong, lastly battery life on all touch devices is poor when compared to older mobiles - WE ALL KNOW THIS BY NOW!! - learn how to use power management features and apps such as juice defender, be aware that lithium ion battery life will improve within the first month if used properly and finally if you don't know these things then USE GOOGLE FFS!! This is a forum for android general discussions not to pointlessly whine when you can't look after your own phone! END OF RANT
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Sent via the XDA Tapatalk App
Click to expand...
Click to collapse
oursoul said:
This.
People are the same with laptops.. just because its portable it doesn't mean its not a fragile bit of modern tech.
Click to expand...
Click to collapse
Whiterin said:
It's all scratched up and broken after only two weeks? Unless you work in construction or something you REALLY need to learn how to treat your devices or stick to something more play school. It's an expensive high tech device, it's not a rubber coated brick. It's a small computer with a 3.7 inch GLASS screen... learn how to treat it.
Click to expand...
Click to collapse
Agreed to all.
I have had iPhones, HTC HD2, Hero etc and never scratched one of them. I don't use screen protectors or cases, I don't need them as I put the phones in my pocket without my keys in that pocket. My left one is for my phone, my right for everything else.
Unless you have had a dodgy unit that is made of plastic, I'd have to say its probably down to how you are storing it!
Good luck with your second one
Hmm interesting replies...
I was driving from work and my sat nav suddenly went muted ant that’s it. When i shake the device the speaker works on and off... so for me this is dodgy speaker
About the scratches... Its only one tiny scratch caused by my PLASTIC button on my pocket ...
Could be anything, a bit of sand in your pocket and you're screen is full of scratches. Pouch and screen protector all the way! Or pay around 400 euro's (directly or indirectly) and don't care what happens to those 400 euro's.
Anyway, there are always devices that can have some problems like a broken speaker or something.
Try reading a forum about whatever device, and there are always the same 'stories' like yours. Maybe it's because we're promised perfection which is impossible. But perhaps it's we all want to have perfection and don't know that's impossible anymore. But! There is a reason warranty exists... sometimes things break. No matter what product.

New product - Liquipel - just purchased.

Okay guys.
So I just got my 4S back from these guys, and wow, I am honestly amazed.
I saw them on my local news a few days ago, and figured what the hell. Apparently they put your phone through a process that binds their product on a molecular level, and makes it "waterproof" I didn't think it'd work as good as in the videos but it really does.
Essentially what happens is, you pay and ship your phone to them. Within a day of receiving it, they treat your phone and send it back. (can do the express version for 10$ more)
I sent my phone in on a monday, received it back on that thursday. I then decided to put it to the test. filled up my sink (about a foot and a half deep), closed my eyes, and submerged my 4s. To my astonishment, I opened my eyes and the screen was still on! I was even able to type a message to my girlfriend telling her I was texting her from underwater xD
I then answered a call in the shower the next morning and all worked fine! Its been a week since Ive gotten my phone back and have done the sink trick countless times to impress my friends, and it still works like new hehe. just thought id share, seeing as a good waterproof case for the 4s is about 20$ more.
http://www.liquipel.com
edit: I figured the accessories thread was the best place, let me know if you feel otherwise ;P
heres a good demo i found of it
http://www.youtube.com/watch?v=XtsSPZCGmuY
Yeh looks good but a pretty short list of approved devices. No SGSII for a start
killall said:
Yeh looks good but a pretty short list of approved devices. No SGSII for a start
Click to expand...
Click to collapse
try emailing them? I thought i read somewhere on there site that they can usually make accommodations for devices not on the list..
And they JUST started taking orders at CES, so they should expand the supported devices soon if theyre doing this good. pretty great start imo xD
Thanks but second problem, I dont think they are in the UK yet.
killall said:
Thanks but second problem, I dont think they are in the UK yet.
Click to expand...
Click to collapse
Ah. Well that might be a problem then xD
killall said:
Thanks but second problem, I dont think they are in the UK yet.
Click to expand...
Click to collapse
It said it was a mail in program... international mail... phone back in like 3 weeks lol
edit:The following devices are approved to be Liquipelled:
Apple iPhone 4s
Apple iPhone 4
Apple iPhone 3g/s
HTC Evo 4G
HTC Evo Shift 4G
HTC MyTouch 4G
HTC Thunderbolt
Motorola Droid X/X2
Samsung Charge
Wow that is amazing!!
Sent from my Hero using xda premium
My understanding is they coat internals of phones & simply keeps the water from corroding intricates.
My initial question was how speaker would still operate as it "coating" not hampering its performance but its answered on websites FAQ.
My question now lies in...if they coat everything that's good BUT what happens when you switch batteries...if the contacts of the battery weren't coated I'd think it could/would short out. No?
Sent from my Galaxy Nexus using Tapatalk
blaine07 said:
My understanding is they coat internals of phones & simply keeps the water from corroding intricates.
My initial question was how speaker would still operate as it "coating" not hampering its performance but its answered on websites FAQ.
My question now lies in...if they coat everything that's good BUT what happens when you switch batteries...if the contacts of the battery weren't coated I'd think it could/would short out. No?
Sent from my Galaxy Nexus using Tapatalk
Click to expand...
Click to collapse
Good question. You might have to email them on that one. I don't have to worry about it since my battery isn't "removable" lol
While I understand the application to any iOS devices because they are naturally closed.
But to other devices you get some variation of success.
The most important areas are the jack ports, speakers, mics, buttons, screws and edges of the opening-backside.
They probably coat the display too "just in case" but that should deteriorate the quality of the touchscreen.
And coating the innards is not necessary, but helps as "secondary insurance" but I'd be worried about the warranty getting void.
We need a device like the NOTE entirely Aluminium-Unibody with only the bottom lip opening up for removable battery, SIM, microSD (like the HTC Legend).
ekin said:
While I understand the application to any iOS devices because they are naturally closed.
But to other devices you get some variation of success.
The most important areas are the jack ports, speakers, mics, buttons, screws and edges of the opening-backside.
They probably coat the display too "just in case" but that should deteriorate the quality of the touchscreen.
And coating the innards is not necessary, but helps as "secondary insurance" but I'd be worried about the warranty getting void.
We need a device like the NOTE entirely Aluminium-Unibody with only the bottom lip opening up for removable battery, SIM, microSD (like the HTC Legend).
Click to expand...
Click to collapse
It sounds like your completely guessing at what "it" does and how its applied. I on the other hand decided to investigate BEFORE acting as if i knew what it was we are discussing.
1. Its applied via vapor,in a vacuum chamber environment, so as to completely coat inside and out, all parts of said device. The coating is 1000 times thinner than a human hair and therefor does not change the way the phone feels or functions(screen response)
2. speakers are not effected because they too are waterproofed in the same nano tech molecular bonding process.
3. When you submerge your device once coated, water does completely run THROUGH your device. Short circuit cannot be obtained because the liquid cannot make contact to the positive and negative/grounding surfaces because of said thin/nano layer of protection. although it repels liquids, it still allows all existing electrical pathways to function without flaw, and will conduct electricity thus allowing for the capacitive functions to work also.
4. This technology was not designed to make your phone "UNDERWATER" proof, and they recommend not submerging any device in liquid. In the case that your phone falls from your hoodie pocket into the toilet, you can retrieve (and hopefully) rinse your device before electrical failure/short occurs. Its a backup plan for accidents, not a solution for mobile underwater photography or social networking.
These statements are not conjecture. this is what happens when you read and investigate what youve read.
If your gonna troll, at least take the time to know what your talking about. F'in trolls!
Not trolling, just thought this was the "old" method previously adopted (was it by Vertu?).
If you call anyone a troll for showing interest then I guess you would be alone in this world as a non-troll, just saiyan
Did you even read what you wrote??? Words like "probably", and other staments like "naturally closed" make you sound like an idiot, which im sure you are not... but if you are gonna post in a category, wouldnt it help to know the subject your posting about. The information is there and one should not have to ?guess?
I on the other hand became very curious about said tech, and therefor did the research needed to contribute to this discussion.
There are no what if this happens in this case because the are selling a tested product, and have limited device compatibility - for now.
I was hoping that when i saw a new post on this thread that it was someone with valuable information, trying to fill gapps of knowledge, but it was just "what if's" and "probably's"... come on. If you want to pm me about what ive learned about this product, ill be happy to share anything else i have with anyone. I am here to learn, not waste valuable time reading conjecture based on nothing.
Hey smart guy why would you come here looking for information when you already know everything?
Even if I was still interested, I wouldn't ask someone like you (just letting you know so you dont have to constantly check you pm)
Later buddy
Seriously guys. This is to get other peoples opinion about the product. No need to argue

Need help identifing antenna in G2

So I was thinking about boosting my antenna signal with those Antenna Booster stickers. I know a lot of people say they don't work, but I think it's because they're not positioned correctly.
Anyway here's a picture of an unfortunate G2 I bought off Ebay used to repair my working G2. I keep it around for spare parts. Are those copper contacts really the antenna? Looks like the metal materials runs under a portion of plastic to extend the range.
I believe that the bottom is for cell use while the top is for blue-tooth and wifi. I was thinking of buying a couple and doing this too boost the phones signal.
There's enough empty space to place these stickers in there and try to boost the signal. Compared to some other phones I've had, this one has a rather weak signal in comparison. Especially in those spotty areas.
Not to rain on your parade but if a $4 sticker that probably costs .04 to make really helped at all, don't you think phone manufactures would already be using them? Any way you identified the antenna correctly, have at it
Sent from my HTC Vision using xda premium
Thanks, I ordered a pack of 6 for $3. I'll report if there's any noticeable difference. I've used one long time ago on my Motorola Razer and seemed to work.
Really wish this phone came with a better loud speaker.
It could have been the placebo effect?
About the speaker, do you think we could find one that fits on eBay or RadioShack or whatever? So as to make it louder?
I noticed when I hold my phone with my left hand, the signal really sucks. I knew the cell antenna was in the bottom section and now I know why covering the left side is bad. I try to just hold the top part but it's hard when browsing or other functions besides calls. We all made jokes about the iphone and the "you're holding it wrong" crap but it seems to be true with our G2 As far as booster stickers go, they have been selling these things for many years now. They have never been proven to work and disproven many times. The placement of the boosters don't matter and were allegedly designed to be placed right side up and behind a battery. They don't supply power therefore couldn't act as a repeater or booster nor do they alter the design of the original antenna not to mention they don't even make contact with it. They used to sell for $20 but now sell for 1 penny lol! The only things that ACTUALLY work are external antennas (few phones even have ports for them anymore), cellfi, uma, repeaters, microcells, etc. So, shell out some real cash for a proven booster/repeater or hold your phone differently. Sorry... good idea though! Worth a shot...
Dukenukemx said:
Thanks, I ordered a pack of 6 for $3. I'll report if there's any noticeable difference. I've used one long time ago on my Motorola Razer and seemed to work.
Really wish this phone came with a better loud speaker.
Click to expand...
Click to collapse
Hello,
any news abut possible signal improvement?
I would like to replace the bottom GSM antenna with better one.
I've already tried couple of modifications, but without success.
I would appreciate if somebody could share hardware modification which really works and improves the GSM signal reception.
Thanks
Hi I have a Spanish G2, Desire Z Vodafone and also appears that since the Demonte to change the screen, gives me probemas coverage, always, sometimes puts all stripes and many others did not put stripes or coverage but you can call ...
I've seen the pictures and these metal parts I have them, I do not know to do. : (
I wrote this at forum:
http://forum.xda-developers.com/showthread.php?t=2090365
http://forum.xda-developers.com/showthread.php?p=38019953
Merci

Bigger battery (at least 3.000mAh) with fitting cover **not juicer**

As the guys from fixit showed in their teardown, it's quite easy to remove the back cover and detatch the battery
So the ideas that comes to mind is: Will there ever be an extra size replacement battery coming with a custom back cover?
I mean the same accessory you can find for mobiles with a replacable battery (such as Galaxy S4)
For example: Does anybody knows wether the BL-T7 battery from the Lg G2 can fit?
** I don't mean a cover sporting a battery juicer.
Don't think so. If they intended to allow users to replace the battery they would've made the back cover removable
This is about what will come to market to enhance the Nexus5
Even if the battery is not made to be replaced every day, who cares?
Do you place and remove the display protecting film every day?...NO, you just place it once and stop caring
It's quite obvious that the poor battery is just a marketing strategy not to overcome the almost as twice expensive Lg G2.
But it's a replaceable part, I mean it's not the soldered ram
http://www.ifixit.com/Teardown/Nexus+5+Teardown/19016#s53713
ice.man said:
This is not what Google-LG cared about
It's obvious to me that the poor battery is just a marketing strategy not to overcome the almost as twice expensive as Lg G2
But it's a replaceable part, I mean it's not the soldered ram
http://www.ifixit.com/Teardown/Nexus+5+Teardown/19016#s53713
Even if the battery is not made to be replaced every day, who cares?
Do you place and remove the display protecting film every day?...NO, you just place it once and stop caring
This is about what will come to market to enhance the Nexus5
Click to expand...
Click to collapse
Personally I have zero battery issues, the thing lasts all day for me and then some with medium usage. That said, it's clear that battery matters a lot to people.
I don't think it was some grand scheme by Google or LG though. They built a phone and kept it under a pretty strict budget. Could they have added a bigger battery? Sure, but there are quite a few people out there that don't need it, and those that do, probably are using things like Notes and Maxx's and such or carrying portable chargers already. You can't satisfy everyone with a product like this and although it's clear that Google is trying to make the Nexus name more relevant, it's part of a market where different people want different things for their phones.
The back isn't meant to be removed by us though, the fact that it is relatively easy to do just makes for quicker, less costly repair times which is all about the bottom line. Using a removable battery also helps keep costs down and keeping customers from messing with it helps as well. Maybe somewhere down the line someone will make a bigger battery for it, but from what most of the sites are saying and the teardown indicates, you shouldn't be holding your breath for it. The Nexus 5 is a great phone for some people and for others it's just not going to be what they really need in which there are many, many alternatives.
Unlikely. A replacement cover would need
-vibration motor
-Wifi, NFC, GPS antennas
-Wireless charging coil
-4 magnets for docking
Just get an external battery.
I wonder if the back is right up against the battery. As in if it is possible to add a slightly thicker battery for longer run time.
ice.man said:
As the guys from fixit showed in their teardown, it's quite easy to remove the back cover and detatch the battery
So the ideas that comes to mind is: Will there ever be an extra size replacement battery coming with a custom back cover?
I mean the same accessory you can find for mobiles with a replacable battery (such as Galaxy S4)
For example: Does anybody knows wether the BL-T7 battery from the Lg G2 can fit?
** I don't mean a cover sporting a battery juicer.
Click to expand...
Click to collapse
G2 battery does not fit
Sent from my SPH-L900 using Tapatalk 4
Hopefully, some enterprising Chinese companies would come up with batteries that'll fit in the phone but with slightly larger capacity.
no thanks...I'm stuck with cinese battery declaring a huge capacity and then dropping all of a sudden from half battery to ZERO battery......
I would totally buy a bigger battery and perform the swap for 25% more life or better
Have you guys seen this?
http://www.smavtronics.com/3000mah-...imus-g2.html?gclid=CO2I_4_O5LoCFQ3hQgodnzYA-Q
anuraj1 said:
Have you guys seen this?
http://www.smavtronics.com/3000mah-...imus-g2.html?gclid=CO2I_4_O5LoCFQ3hQgodnzYA-Q
Click to expand...
Click to collapse
comapring the ifixit pictures with that one, the battery connector is on the wrong side.
The cover would be pretty spendy I bet. The vibrate motor is attached the back cover along with the wireless charging. Is the NFC also part of the cover? Anyway, if it can be done it probably will but I'd be concerned over the quality of the battery if the whole package doesn't cost quite a bit.
Here is the idea:
preserve the original cover, just add a "bridge" between the main body of the phone and the cover, like an inner case-juicer
I think if the Nexus5 could reach the shipping goals of S3/4 or iPhones......for sure someone would start manufacturing this kind of product
but actually the engineering is to expensive compared the market size
Here is the idea:
preserve the original cover, just add a "bridge" between the main body of the phone and the cover, like an inner case-juicer
I think if the Nexus5 could reach the shipping goals of S3/4 or iPhones......for sure someone would start manufacturing this kind of product
but actually the engineering is to expensive compared the market size
Read somewhere that the name of the item is misleading. It's not 3000mah.
Where did you read jt
Sent from my Nexus 5 using xda app-developers app
anuraj1 said:
Have you guys seen this?
http://www.smavtronics.com/3000mah-...imus-g2.html?gclid=CO2I_4_O5LoCFQ3hQgodnzYA-Q
Click to expand...
Click to collapse
Note: This battery is not compatible with LG Nexus 5 16GB. Click here for LG Nexus 5 16GB Battery.
Click where?
Sent from my Nexus 5 using xda app-developers app
detdett said:
Click where?
Sent from my Nexus 5 using xda app-developers app
Click to expand...
Click to collapse
That's a direct quote from the website

Is there a single NFC tag which changes the content by physical key press?

Hi,
I am not sure whether to post this here, but I take a leap and try it as you might have seen more tags than I did. Please bear with me....
A year ago I came by a local store and I saw NFC tags (mostly the sticker type) on display. I knew my next phone would have NFC so I tried to remember. But one NFC gadget - I got only a glimpse - impressed me:
An NFC pen! Wow, I said to myself, that I want to have. In my mind I saw huge possibilities that the pen would offer: every press on the pen, that inside tube, usually with advertisments, would turn one step. Not to reveal the next ad but to activate the next NFC tag, from my experience (with pens!) I guessed it must be at least 4, maybe 6 tags to cycle through.
Imagine... sitting in a lesson or lecture or meeting or whatever, holding your pen, pressing it a few times, holding it ontop of your Phone - especially while face-down - and silently and unnoticable trigger up to 6 different events... all in one pen, all in one hand.
Guess what, I came by today, very eager to buy and saw that NFC pen. It was a pen. WITH an NFC tag. A single one. What's that good for? If my tooth brush had an nfc tag, it would be of more use (keeping track) - at least to me.
So why the heck bother you with my unmature tech ideas? Did anyone stumble upon any device with a tag/gadget that would support switching tags by keypress? i couldn't find any hint.
Would it be possible with a designated hardware button? My guess is yes, but maybe not in a pen but in those "dogtags"/keyring ones.
If I look at those transparent sticker tags, solve it by using the same antenna and dis/connect the actual logic part. Maybe a little more resistence and noise on the wire switching part would be tolerable.
Or the chip itself could be given a multi personality either the NFC way (speak: is there any technique defined in the nfc specs) or by a contact which is measuring increasing electrical resistance.
Those all are WILD GUESSES. (i got shaky hands, soldering so small structures is not so... pleasant to me, so I won't give it a try)
My idea cannot be so unique, so it must be either technological impossible or economically improbable (say: to expensive to build and sell, not enough sales expected.)
Again, why bothering you? Because here might be so much Expertisé and experience that might yield a hint or two. And, maybe my expectation of a NFC toothbrush... Ahm pen might have amused you.
Nice to hear from you!
(PS: expensive Oral-B electrical tooth brushes do come with .... what? BLUETOOTH!)
Have a look at 'Air Button' and 'Dimple'.
Sorry, I can't post external links as a new user.
leroy30 said:
Have a look at 'Air Button' and 'Dimple'.
Sorry, I can't post external links as a new user.
Click to expand...
Click to collapse
Thank you very much! I couldn't imagine so i didn't research properly enough. Dimple is my choice!

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