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Wireless Driveway Alarm features The Hosmart Motion Sensor with Wireless Motion Alert is a convenient and affordable safety / security system. 1.weatherproof outdoor sensor with adjustable sensitivity control. 2.The sensor may be placed up to a 1/4 mile from the base unit in ideal condition. 3.Alerts with light and sound when vehicles or pedestrians approach within a 30 feet radius. 4.Expandable up to unlimited sensors and unlimited receiver, it is perfect for home, business, property and work site. 5.Super simple to set up. Takes only a few minutes to set up. Easy do it yourself installation. 6.Set includes One sensor and One receiver. Detects motion in up to 4 different zones, Low battery indicator included. 7.Receiver can be plugged in using included AC adapter or can run on (4) AAA batteries.