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Liftmaster

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Liftmaster 835LM Perimeter Alert Passive Infra-Red (PIR) Motion Sensor Liftmaster 835LM Perimeter Alert Passive Infra-Red (PIR) Motion Sensor
The Perimeter Alert uses a Passive Infra-Red (PIR) Motion Sensor to detect movement of people and vehicles, while allowing small animals to pass through undetected. The Base Station is powered by the AC adapter and the 4 AA batteries supply power in case of a power outage.
$84.95