ID RFID Silicone Wristband/Bracelet ID 125 Read Only TK4100 Compatible with EM4100/EM4200 (Pack of 5)

I like to put my linktree on NFC tags and use it to advertise myself, it is a fun little thing that people always are impressed by.

UPDATEDI am reducing my rating to one star, and am returning these.After testing all five, one of them is definitely defective with numerous errors.As for the remaining four, while they can be programmed and the UID can be changed, the sensitivity (range) is so poor that they are just not useable. Locks can only read them about one out of 25 attempts, and you have to move the bracelet around until finding a "sweet spot" where the lock can read it. The very same locks have absolutely no problem with five other brands of generic cards and fobs.I noticed that some of the five bracelets, when the part containing the NFC chip is pressed between the fingers, have unusual anomalies (dips and valleys). I suspect that these are factory seconds that did not pass quality control but being sold as good.****************************************************************************These do have changeable UID ("magic card"), and they are ISO14443A (1K Classic MiFare). But they have issues.I ordered the five pack. The first one that I programmed (using a Flipper Zero) failed the write operation the first four tries. Then, inexplicably, it succeeded the write on the fifth attempt. The second one wrote successfully on the first attempt (again, using the Flipper Zero and writing the exact same file). (I did not bother testing the remaining three in the package).When used with locks, they are very difficult for the lock reader to detect and read, and require moving, holding still, moving again, holding still, moving again and holding still for several seconds each time before the lock will finally read it. I have not had either of these issues (writing OR reading) with numerous generic (inexpensive) cards and fobs from other vendors.The bracelet is comfortable, and seems robust enough to me. I do not anticipate that it will easily break, and the connecting mechanism seems fairly secure to me while also maintaining a low profile. It does feel like soft silicone.So, technically they work, but they have very poor sensitivity and range.

I needed these for 2 factor authentication on all my accounts and it worked perfectly! The other ones I used for simple things like phone and laptop access!

Bought these and found them pretty easy to program. However, I tried them with my roommates iPhone, and they didn't seem to work. Works well with my android phone though.

Used a Proxmark to clone my convention hotel key onto a wrist-band so I didn't have to worry about losing the keycard when in costume. Worked perfectly following the directions for a Gen1 magic tag!One note, I found it un-clipped too easily from my wrist, so I took the "pin" out and flipped it around, then fed it thru so that it was "clipping outward" from my arm and that seemed to fix all the issues keeping it firmly affixed to my arm yet loose enough to be comfortable, at the cost of being slightly more difficult to put on and take off (but that was the whole point - hard to accidentally come off too)This is like a dream come true!

The media could not be loaded. They’re good for the price, just wish the speed was faster more consistently. They’re pretty easy to use if you understand the technology.

It didn’t work at all don’t buy

These work great after programmed. The fastener comes loose even when fastened completely. It has fallen off several times luckily I saw it when it did fall.