Shock Sensor Alarm for door and Window

This door/window alarm works well on glass, wood or metal door or window.

How to use: Flip the switch on the left of the unit to " on " position. If anyone hit or break the door or window to which the unit is attached, this door/window alarm will give a 20-30 second warning signal. Filp the switch to the " off " position to turn off the unit.

Installation: Peel off the cover of the enclosed adhesive tape for easy attachment onto the door or window.

Operation: This door/window alarm requires 3x1.5vL R44 batteries. When the volume becomes low, pls replace batteries with those of the same type.