Guardline Extra Receiver for Original Driveway Alarm Extra receiver compatible with the original Driveway Alarm by Guardline. This receiver will NOT work with the Guardline 1/4 range driveway alarm . The 1/4 mile extra receiver must be purchased to work with the 1/4 mile range driveway alarm. A total of 4 receivers can be added to the driveway alarm set. Awesome Local Tech Support. Two Year Manufacturer's Warranty