GLASS GUARD VIBRATION ALARM
Vibration-sensitive window alarm easily attaches to any window or sliding patio doors and is set off by vibrations. Alarm deters intruder, then resets itself. Leaves you and your home well-protected. Choose high or low sensitivity, adjustable volume control. Requires four AA batteries, not included. Plastic, 2 1/2 x 2 1/4''.
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