Unlock mode:RF Card / Mechanical key Operating voltage: DC 6V (4 AA batteries) Static power consumption: 120 Dynamic power consumption: less than 200mA Battery life: about 15,000 times normal continuous operations Undervoltage instructions: When the operating voltage is lower than 4.5V, the door will alarm (beep sound), can still be unlocked about 100 times Unlocking records: lock the EEPROM to store the latest 828 the open Kai also Mechanical key Unlocking records Mechanical key: the drive system is completely independent mechanical emergency unlocking mechanism, High security Mechanical key to ensure that the case of an emergency door lock can still open normally