The Mini Alert Alarm uses passive infrared technology to protect your room from intruders. The mini alert alarm produces an infrared triangle which creates an unseen barrier that's impossible to penetrate without setting off the alarm. The mini alert can be easily moved to a new location. A mounting bracket is included. The Mini alert alarm requires three AA batteries. (not included) The many alert alarm measures 4 1/8" x 2 3/16".
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