1: When you hear the sound "Ge Ge Ge... "constant voice or the alarm voice less than 10 seconds and stop alarm at once, that means the battery will be worn out, you need to replace the battery. Please use the provide spanner to spin out the four screws, then take away the top cover and replace the battery. Please pay attention to "+" and "-".
2: At regular intervals, clean the keyhole and the pin.