... set 3-8 combination LED Electronic card lock for safety box,electronic gun safe lock,electronic keypad lockIdeal used in electronic safes and strong ... emergency use, while both codes were forgotten.* LCD display date, time. Also display OPEN,CLOSE or ERROR indicate the operation status.* ... , it is for emergency status. * Indication lower-battery on LED, about the time to change the batteries. 4×”AA” ( ...