Chip: NFC215 Usable capacity: 504 bytes Protocol: ISO14443A Working frequency: 13.56 MHZ Reading and writing distance: 1 to 5 cm Reading and writing time: 1 to 2 Working temperature: -20 to 55 degree, humidity of 90% Erase : 100000 Data storage: 10 years Reading time: 100000 Size: 86.5x54x0.8mm NFC IC reader/writer NFC Enable Phone color: White : PVC Compatiability: 1) Support 13.56mhz RFID and NFC IC reader/writer, For example:Acr122u reader/writer 2) Support Smart mobile phones with NFC function. Package Contents: 50 x card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.