Driveway Patrol infrared wireless alarm system is used to monitor the mailbox, garage, driveway or countless other places Battery operation and 400 foot range means no wiring is necessary When a vehicle or person passes the sensor, the receiver emits an audible tone.When a visitor--wanted or unwanted--approaches a house on foot or in a vehicle the motion-detecting sensor unit of this warning device sends a signal to the receiver indoors, which chimes an alert. The device is wireless and has a 400-foot range. It requires three C-cell batteries for the receiver and one 9-volt battery for the transmitting sensor. The sensor is housed in weather-resistant plastic housing, installs with a screw on any surface, such as a mailbox post, garage, or door, and measures 4-1/4 inches high, 2-5/8 inches wide, and 2-1/4 inches deep. The portable receiver has an identical housing, and can be set to chime high or low (or turned off), and measures 5 inches high, 3-5/8 inches wide, and 1-1/2 inches deep

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