Wireless Infrared Security Motion Detector Waterproof Single Beam Body Detector Sensor Alarm for black.Feature: 1. Single Beam Technology: The wireless infrared detector uses single beam technology, reliable and accurate motion detection, effectively deterring any intruders. 2. Durable and Waterproof: Made with waterproof and dust proof design, this wireless motion detector alarm effectively withstands harsh weather conditions, with its internal parts kept safe from damage caused by rain or snow