The Dakota Alert MURS wireless driveway alarms and radios has a range of up to 4 miles. Choose from motion sensing or magnetic vehicle probe sensor to detect people or vehicles entering the property. The battery powered sensor transmitters can be placed up to 4 miles away from the base station receiver. Add a portable wireless hand held transceiver for alerts anywhere on the property. MURS base stations and portable transceivers can also be used for two way voice communication.