The DA-503 Drive-Alert Driveway Alarm system incorporates built-in X-10 transmitters that use a home's existing electrical wiring to transmit a signal which sounds chimes when a vehicle enters a driveway, or wherever a sensor has been buried.You will not be disappointed with Mier DA-503, Drive-Alert Driveway Alarm System, Hardwire Kit w/Remote Chime, Sensor, Cable
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