The Swann Magnetic Window/Door Alarm (Pack of 8) is a wireless alarm which uses magnetic affinity, or lack thereof, to activate an intense 110+ dB siren. You can mount this unit on your window or door; the alarm will be activated instantly when anyone separates the magnetic trigger from siren unit.
The magnetic alarm is powered by 4 LR44 batteries and features a simple on/off switch which is concealed under the panel.
Magnetic Window/Door Alarm (Pack of 8)
Double-Sided Mounting Tape
LR44 Alkaline Battery