Fit the alarm on the bracket and turn the alarm body clock wise, until fully inserted on the bracket. the unit wiil generate a "beep" indicating that it is activated and ready to detect status.
No drilling required, the alarm can be installed directly by sticking the magnet, which is easy and fast.
10-Year Service Life
A sealed lithium battery powers the device to protect the family for ten years, which would spare users' efforts to replace the battery from time to time.