... 20, 30m 3.Intelligent Judgments 4.used for window, perimeter, etc Hot!! wired active infrared ... etc)Hot!! wired active infrared detector (used for window, perimeter, etc)Features: 1.Intelligent Judgments ... rain,with anti-rain structure,be suitable for the installation of indoor,outdoor and wet ... of shell,polished of surface,durable;adopted imported filters that have good filter function to visible light ...