chip: TK4100 / TK4101, fully compatible with EM4102 Working frequency: 125KHz Working pattern: Read-only Induction distance: 2~10cm Internal serial number: 5 bytes Size: 85.5LIV × × 1.80mm (cum portable foraminis) R / W range: 2~ 10cm, depending on the reader and the application environment Working temperature: -20℃ ~ LXXX ℃ (-4CLXXVI ℉ ℉ ~ +) materials: ABS Wipe times: >100,000 times Data storage: 10 annorum