Specifications Opened by Guest's psaaword or Master password.
If the lock loss power, the lock can gain the power from outside by battery box.
Technical and functional index:
Power supply: 4.5V DC use of 3 pieces of number 5 (or number 7) AA alkaline batteries, with low voltage warning
Static consumption: 3uA maximum
Dynamic consumption: About 250mA
Battery lifespan: 10, 000 times under low voltage warning, it can open door 150 times at least
Working temperatures: -20° C to 70° C
Humility: 98% maximum.