The Dakota Alert DCMA-4K Driveway Wireless Alert System helps protect your property from intrusion and theft. This kit includes the DCMT-4000 Motion Detection Transmitter and DCR-4000 Receiver. The transmitter features a passive infrared IR sensor that detects motion in the monitored area and immediately sends a signal to the receiver. Once the receiver receives a signal it automatically triggers an alarm alerting you about the intrusion. Detection RangeThe transmitter can detect a person or a vehicle at a distance of up to 50′ and sends a signal back to the receiver located within 1 mile may vary depending on the environment. Power SourceThe sensor unit operates on one 9V alkaline battery not included while the receiver can be powered using the included 12VDC adapter. Multiple Tracking ZonesYou can connect multiple motion detectors or other transmitters to the DCR-4000 receiver unit to create a complete security system. The receiver supports up to 12 different tunes selected from the transmitter’s end to distinguish between different zones from where the signal has been detected. A volume control allows you to set the sound to the desired level.