... 3 pcs AG13(4.5v) button batteries, battery life:10-12months Specification(cm): 65CM(L) X 1.2(W ... with serial movement or viberation. Each alarm will cost 10 seconds.3. When you hear the sound Ge. ... stop suddenly, that means the battery will be worn out ,you need to replace the battery .4. When ... , remove the two screws beside the lock hole , take out the rubber washer ,you can replace the old battery , ...