size : Requires 3 AA batteries (not included). Alarm base measures 3 1/4” long x 1” wide x 5 1/4” high; magnetic sensor is 1/2” long x 3/4” wide x 2” high.
Home security made easy and affordable — with no wiring required! Easy-to-install, two-piece alarm features a main unit that attaches to any door with included hardware, and a small magnetic sensor that attaches to the door frame with peel-and-stick ease. Simply set your own security code and arm it when you leave. When you open the door upon return, a beep will alert you to disarm the unit or an alarm will sound. Works on windows, too! Optional chime feature notifies you when a door opens — great for caregivers. Instructions included.