1. Small NFC tags: The package includes 50 clear NTAG213 NFC tag stickers. These rectangular NFC stickers measure 2 x 1 cm. The transparent NFC tags are self adhesive, incredibly thin, and nearly invisible, enabling NFC functionality for most items. The labels are typically used in hidden locations, such as between surfaces or on the back of objects. Note: Not compatible with metal surfaces or strong magnetic fields. 2. Wide applications: These NFC stickers feature 100% original NTAG213 chips, compatible with NFC enabled smartphones and devices (cannot be used for amiibo tags). You can program these NFC tags to share social media, music, business cards, connect to Wi Fi, create a smart home, and more. Ideal for check ins, product information queries, gaming, access control, posters, book borrowing, etc. 3. NXP chip: The transparent NFC tags are embedded with 100% original NXP NTAG213 chips, pre formatted as NDEF type 2 during production. Operating frequency: 13.56 MHz, 144 byte memory. scan sensitivity with a working range of 0–10 cm. Lifespan: 10 years, 100,000 read/write cycles. NTAG213 chips support read/write lock functions, allowing repeated editing or read only settings. Configurable to edit or reset after reading.