Introduction RFID (radio frequency identification) technology, also known as radio frequency identification, is a kind of communication technology. It can identify specific targets and read and write relevant data through radio signal without establishing mechanical or optical contact between identification system and specific targets. 2 Performance parameters 1. Chip: ntag213 2. Working frequency: 13.56MHz 3. Maximum gain: 1.5dbm 4. Size: 5x5mm 5. Standard: 14443a, 144 bytes memory 6. Times of reading and writing: > = 100000 times 7. Service life: > = 10 years 8. Sensing distance: about 8-20mm (depending on the card reader) 9. Power supply mode: contactless data transmission and power supply 10. Working temperature range: - 20 to 85 3Main characteristics and Application Bluetooth headset, Bluetooth speaker pairing, support IC card door forbidden function Package includes:5pcs/set Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.