50 PCS NFC Tags Sticker with NTAG213 Chip Blank NFC Stickers Adhesive Labels RFID Tags Rewritable 144 Bytes Memory Compatible with All NFC-Enabled Smartphones and Devices

These do work with Ubiquiti/Unifi/Access readers (if you turn on "3rd party" cards option), although they are very low security (since any phone with NFC can read/impersonate them). But they are great if you don't need that level of security. They *are* pre-programmed with a 10-digit number on each tag (although it is not printed anywhere; you can use a USB HID reader and obtain the number if needed, or read it from a phone app). And it appears to be somewhat random (not sequential). The first 4 tags were numbered 2458982148, 2458981124, 2459045892, 2459048964. I can't spot the pattern, if there is one, other than the numbers are increasing. I don't know if different batches would have tags with the same number, but it is possible. It might even happen in the same batch (which could be problematic). Of course, you can reprogram the number to something else, but that is an additional hassle and wouldn't help with knowing if that number was already used. I do wish they enclosed documentation with the exact numbering methodology/scheme; it wouldn't cost them hardly anything to do (1 piece of paper). Anyway, I tested sticking these to the back surface of ID badges, and so far they seem to hold up well (if you clean the surface first). None of the several I have been using with people for several weeks have failed in any way. They are reasonably sticky and constructed well and easy to remove from the backing. Then I tested actually laminating these INSIDE newly-made ID badges. To my surprise, the heat/pressure didn't damage them and they work fine! Also didn't seem to affect the range. With the Unifi readers, that seems to be about under 1 inch or so, which is reasonable for such a small tag. Overall, I am very happy. Except for not knowing how they are numbered, they are nearly perfect for what I wanted to do and will likely buy many more.

El producto funciona muy bien y se programa fácilmente con nfc tools. Lo he probado y usado tanto en iPhone como en Android y funciona de maravilla.

Works great! Embedded into a plastic ring that is 3mm thick, picked up by several phones. Worked best with apple devices, android surprisingly was hit or miss. Read through phones with cases as well. Great range. Id say upto 10mm applications should be fine.

10/10 recommend! I used these on my press on nails to make business card keychains and they work great!

The LeadSeals 30 PCS NFC Tags Stickers with NTAG213 chips have been a fantastic addition to my tech toolkit. Functionality: These tags are rewritable and programmable, allowing for repeated edits or setting them to read-only mode for added security. UBUY Compatibility: They work seamlessly with all NFC-enabled smartphones and devices, making them highly versatile for various applications. WALMART Design: The adhesive backing is strong, ensuring they stay in place once applied. The white finish blends well with different surfaces, maintaining a clean look. Durability: Made from environmentally friendly PET material, these tags are waterproof, smooth, and wear-resistant, ensuring longevity even in various conditions. AMAZON Memory Capacity: With 144 bytes of memory, they are sufficient for storing URLs, contact information, or other small data sets. SHOP NFC Overall, these NFC tags are reliable, easy to use, and offer excellent value for various NFC applications. Highly recommended!