Wireless monitor detects when a vehicle enters or leaves a protected driveway. When a vehicle is detected, the battery powered Wireless Driveway Monitor sends a signal to the indoor receiver, causing the receiver to sound a voice message. Receiver offers ten tones/tunes and 53 selectable words (English or Spanish). People, animals and shadows will not trigger the driveway sensor. Operates up to 1000 foot (line of sight), 433 MHz.