YARONGTECH 125khz rewritable T5577 Sticker Black Coin Adhesive Back Dia 25mm Thickness 1mm -5pcs

Works as intended and are very sturdy. Adhesive is quite strong as well.

These work perfectly for HID using a proxmark3 to write. lf hid clone -r xxxxxxxx

I love this product. It's easy to write the code. And it sticks perfectly to the back of my phone. No more key fobs 🙌

Happy to say that these are compatible with HID systems. Recently moved into an apartment where you have to use a fob just to get into the leasing office and pool so it's become super annoying to have to have my keys with me all the time. I was able to get an RIFD duplicator and copy my original fob onto the se tags and I put one of them on the inside of my Apple Watch band and it has done me well. Gone are the days of not having my stupid fob to go get a coffee from the office. I just simply tap my watch band to the reader and boom. It works. Definitely worth the money for sure. Seems to be sticking to my watch band pretty well so far, time will tell.

These are great. They are very thin and have excellent adhesive. Perfect for door access systems. I would highly recommend.

Easy to write, work well, very small. useful

Don't complain, its functionality unless you have written any data to the chip. Once data are (maybe read and copied from another to this chip), then it is great little, good looking product to replace any like credit card badges or key fobs. Note: I used my Flipper Zero to copy my 125kHz badge card and wrote same data to the chip and voila... All OK. But, if have only reader and used to upload a fixed hash to database, then re-consider purchase. You simply need RFID writer

Funciona muy bien. Lo he puesto en la funda del móvil para abrir el portal sin necesidad de sacar el llavero.

Excellent product. The RFID reader/writer I bought came with fobs and cards but none of them worked. I purchased these and they have been a life saver. Highly recommended.

Funktioniert gut

Very good item