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Let You Know When Someone Or Deer And Other Wildlife Pulls In Your Driveway. Proximity Alarm Detection Noise Maker: The Wireless Outdoor Walkway Thru Doorway Hallway Motion Body Sensor Uses A Highly Sensitive Dual Pir Motion Sensor And Shopkeeper Detection, Reduce False Alarms Caused By Rain Or Insects. Doby Sensors In This System Use An Infrared Motion Sensor To Detect Heat And Movement When Entering Or Proximity So You Can Quickly Be Alerted To Movement On Your Driveway, Front Porch, Gate, Shed, Walkway, Threshold Or Even Swimming Pool. Great For Homes, Businesses And Offices. Can Add More Motion Sensors And Receivers To Detect Motions In Different Areas. Each Receiver Can Program With 8 Transmitters And Each Transmitter Can Add More Receivers For Complete Coverage Of Your Perimeter. You Can Use The Remote Control To Easily Control The Receiver On And Off, Volume Adjustment And Mute, Etc.