It monitors the surroundings and announces visitors by creating an unseen barrier that’s almost impossible to penetrate without setting off the alarm! Simply mount the unit on a table or wall so it focuses on the detection area. When the Sensor Guard is in the monitoring position, any detected motion will activate a pleasant ding-dong chime. When switched to the alarm setting, any detected motion will sound an 80 dB alarm. Sensor has a 26-foot (8 meter) range. Includes wall/ceiling mount plate with bracket. Easy to use, no wiring required, battery operated, uses three AA alkaline batteries (sold separately)Size: 2 3/4” x 1-1/2” x 4-1/2”

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