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. All Products From Us Have Undergone Strict Quality Checks. If There Is Any Quality Problem Or You Are Not Satisfied With The Product Contact Us. We Will Give You The Best Solution.