Mighty Mule Indoor Receiver for Wireless Driveway Alarm

This Mighty Mule Indoor Receiver for Wireless Driveway Alarm (Model# FM231, Item# 510725 sold separately) works when positioned within 400ft. of the alarm transmitter. This unit will announce the arrival of a vehicle in the driveway via both chime and LED. Low battery indicator alerts you when 2AA batteries (not included) in the outdoor transmitter need replacement. Multiple receivers may be used with the Wireless Driveway Alarm as long as they are positioned within a 400' range of the transmitter.