Functions and features:
Opened by Guest's psaaword or Master password. 
If the lock loss power, the lock can gain the power from outside by standby battery box
It is applicable to the chests and cabinets in places like enterprises, institutions, schools, public bathhouses, sauna bath centers as to make management more convenient and intellectual
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