Khis: SLE 4442/SLE5542 Protocol standard: NTXIAS 7816 256 bytes of EEPROM organization 32 protected memory composition 3-byte user password, the password error count: 3 times Minimum Write/Erase time: 2.5ms Operating voltage: 5V Maximum supply current: 10mA Working temperature: -35℃~+80℃ Endurance: > 100,000 times Data Protection: > 10 years Size: CR80 86×54×0.88mm Material: PVC/PET/PETG/ABS,lwm yam.