Wireless PIR detector, no need of wire, easy to install, can detect if there is anybody intruding in, Wireless PIR detector, easy to install,can detect if there is anybody intruding in,the light send signals when power become weak.The distance can be detected is adjustable: from 2M, 4M, 9M;Angle: 15 degree Self-test period: 30s Install height: 1.7-2.5Meters (suggested height 2.2Meters); Size of ...