This is a blank 25mm NFC sticker - often used for inventory, identification but also found in other systems where a flexible, thin tag is desired. The tag contains a small NTAG216 RFID chip with 888 bytes of usable space, good speed, read distance and can be made read-only. It comes with an antenna, and is passively powered by the reader/writer.
Note: Because this sticker contains no protective shielding, it works best in conditions where it is not placed directly on metal.
- Datasheet (NTAG216)