These units will detect vehicles with a small sensor that can be buried in the ground, sending a signal to a receiver (sold separately) that can be placed 1 mile away from the transmitter. The sensor unit operates up to 6 months on just 6 AA batteries, and is highly recommended for long term field drug enforcement operations, monitoring illegal dump sites, perimeter applications and much more. The receiver can operate using standard household current or 12 volts for field applications. When motion occurs, the receiver outputs an adjustable and audible alert and outputs the industry standard alarm signal which is great for triggering DVRs, multiplexers, and for integration to alarm systems. We also offer the RPIR which will detect people and motion. Note: RREC receiver unit required (sold separately).