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The Mini Alert Alarm uses passive infrared technology to protect a room from intruders.
Producing an infrared triangle, the Mini Alert creates an unseen barrier that's impossible to penetrate without setting off the alarm! There is a 30 second delay before the alarm goes off, giving you plenty of time to turn the alarm off when you enter the room. Battery operated, the Mini Alert needs no wiring and can be easily moved to a new location. Mounting bracket included. Requires three "AA" batteries.