YARONGTECH rewritable rfid 125khz T5577 coin tag adhesive back Dia 25mm thickness 1mm (pack of 5)

These are a great product, really slim and very robust. Flipper zero wrote an EM4100 code to them with no issues. I have tried 3 other products and this one was the best. I've ordered more.

I used these to stick on the back of my phone to access my apartment door sensor. Easy to program and stick on well.

Took the tag to my local key maker and they made the copy of the key fob like you would normally do and worked great ! Stick the sticker between my iPhone and the case and ready to go (make sure you put it at the bottom not the top otherwise the reader picks up Apple wallet) With my flat smart lock and this, I don’t have to carry keys or fob around anymore just my phone.

The T5577 coin tag worked perfectly with my Flipper Zero. It came completely blank, with no pre-existing data, unlike some other cards that aren’t writable. I had no trouble at all writing PAC/Stanley data onto it. Highly recommended for anyone needing a reliable and writable card.

I copied my office key onto one of these disks and stuck it to my phone case. Now my colleagues want me to copy theirs for them too!

Great to keep in my phone as I never leave that at home haha

didnt work waist of money

Programming these discs was simple. I have one of these tags stuck on the inside of the outer skin of my wallet. Simply presenting it to the door sensor works perfectly every time. You do have to use a programming machine to copy an existing tag onto these discs. With such a machine (from church. £14) that is simple to do.

Works as expected. Comes blank and is not readable. Needs an initial writing and works after this.

The chips come completely blank ... if you try to read them nothing happens. (Which is possibly why it's got a high return rate). After you write your configuration (i.e. EM4100/HID/Proxmark) and data to it, it's read easily by your access control system. Works about as well as my Keychain fob (HID)!

I recently purchased the YARONGTECH 125kHz rewritable T5577 Sticker Coins, and they've proven to be a fantastic addition to my tech toolkit. Here’s a detailed review based on my experience using them with a Flipper Zero for rewriting fobs, and their practical applications such as sticking them behind AirTags or phones. Build Quality and Design The YARONGTECH T5577 Sticker Coins are well-designed with a diameter of 25mm and a thickness of just 1mm. Their slim profile and adhesive back make them incredibly versatile and easy to conceal behind devices like AirTags or smartphones. The stickers feel durable and adhere securely to various surfaces without any issues. Functionality and Performance These sticker coins are based on the T5577 chip, which is known for its reliability and ease of use. Rewriting the fobs using my Flipper Zero was straightforward and efficient. The stickers responded well to the rewriting process, with no errors or failures, ensuring that my access credentials were correctly cloned each time. Ease of Use Using the YARONGTECH stickers with the Flipper Zero is a breeze. The process of rewriting the fobs is intuitive, and the stickers are highly responsive. This makes them perfect for users who need to frequently update or change their access credentials without hassle. The adhesive backing simplifies application, allowing for quick and secure attachment to various surfaces. Practical Applications One of the standout features of these stickers is their versatility. They can be easily placed behind AirTags, which allows for seamless integration into everyday items that you want to track and access securely. Additionally, their slim profile makes them ideal for sticking behind phones or inside phone cases, adding an extra layer of convenience for access control systems. Value for Money The 5-pack of YARONGTECH 125kHz rewritable T5577 Sticker Coins offers excellent value for money. Considering their functionality, ease of use, and versatility, these stickers are a cost-effective solution for anyone needing reliable and rewritable RFID tags. Their durability ensures they will last through multiple rewrites and applications, making them a worthwhile investment. Conclusion Overall, the YARONGTECH 125kHz rewritable T5577 Sticker Coins are a top-notch product for anyone in need of flexible and reliable RFID tags. Their easy rewriting process with Flipper Zero, combined with the convenience of adhesive backing, makes them an ideal choice for a variety of applications. Whether you need to update fobs frequently or want a discreet way to enhance your access control system, these stickers deliver exceptional performance and value. Pros: Durable and well-designed with a slim profile Easy to rewrite using Flipper Zero Strong adhesive backing for secure attachment Versatile application, perfect for sticking behind AirTags or phones Excellent value for money Cons: None that I have encountered The YARONGTECH 125kHz rewritable T5577 Sticker Coins have exceeded my expectations and proved to be a versatile and reliable solution for my RFID needs. Highly recommended for anyone looking for easy-to-use and efficient rewritable tags.

Perfekt!

Wrote fine using those blue pistol grip type reader/writer. Now I can use my phone's magsafe grip to open our building door! Wrote to all 5 tags, all working fine.