Khis: TK4100/TK4101, fully compatible with EM4102 Working frequency: 125KHz Working pattern: Read-only Induction distance: 2~10cm Internal serial number: 5 bytes Size: 85.5×54×.80m (ib portable) R/W range: 2~cwm, depending on the reader and the application environment Working temperature: -20°C.+80°C (-4℉~+176℉) Materials: ABS Wipe times: >100,000 times Data storage: 10 years Notice: JavaScript yuav tsum tau rau cov ntsiab lus no.