... state, the system is in the state of energy saving, without display.4. In case of power-down, no password and door opened ... revolving to open the door.3. In the case of wrong password , “ERROR” will display, the buzzer continuously sound, indicating error, here, ... master password:In the case of door closed, press the key “↓” twice, “super” will display before inputting master password of 6 digit, (no ...