... keys --- for emergency use, while both codes were forgotten.* LCD display date, time. Also display OPEN,CLOSE or ERROR indicate the operation ... the latest 120 opening records could be checked, opening date,time, user code or master code.* Entered incorrect 4 times consecutively ... for emergency status. * Indication lower-battery on LED, about the time to change the batteries. 4×”AA” (1.5V) batteries ...