SECO-LARM RC-135Q is a wireless motion alert system that provides audio and/or visual alerts when triggered. With a sensor range of up to 26 feet and a transmission range of up to 390 feet, it's ideal for monitoring large areas. The plug-and-play operation makes it easy to set up, and the battery-operated design means you can place it anywhere without worrying about wires. The receiver has four operation modes: High (audible alert and LED flash), Low (quieter audible alert and LED flash), Silent (LED flash only), and Off.