... than 150 milliampereworking voltageinternational standard batteries, Four 1.5-volt alkaline batteries, direct current 6-voltUnder voltage target: less ... :First step: press any key, fingerprint screen lights up;Second step: press any key again, fingerprint screen blacks out, ... time;Fourth step: During red light flashing, input password second time;Fifth step: check no problem, lock sounds twice ...