YARONGTECH MIFARE Classic 1K Tag Coin Round PVC Material 0.9mm Thick Adhesive Back (Pack of 10)

Some reviewers have complained that either a small or substantial number of these units failed to be readable as RFID chips. This was not the case in my order, where all the chips could be read and written to, with a bit of difficulty in locating where the reader was in my phone.They work with other RFID-reading devices like locks.I even punched a hole in the middle of one to see if it would still work (since the antenna is mostly a loop of conductive wires painted onto the sticker around the edge, leaving the middle empty of functional components). This obviously won't work if the antenna or small logic chip attacked to the outer edge of the antennae are damaged.So 0% of the units were defective, 100% readable out of the bag (locating the *exact* location of the NFC head on one's phone can be surprisingly difficult) both by readers and writers, including access control devices.

Data blocks all read and write properly. However, I was disappointed that I could not write the manufacturer block 0. The company should explicitly mention that in the description, in future.

I was able to create a new key for my talaria xxx. Works with no issue.

Worked great for me and my 13.56 frequency cabinet lock.I put these locks on all my concealment furniture I make.

I wanted to stick one on the back of my phone case so I don't need to dig out my key card all the time, but it doesn't work when next to the phone unfortunately. Other than that, these work great!