driveway patrol sensor and receiver kit
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 . batteries are not included . the sensor is housed in weather-resistant plastic 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 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 . -- fred brack