... active infrared detector 2.alarm distance:20, 30m 3.Intelligent Judgments 4.used for window, perimeter, etc Hot!! wired active infrared detector ... (used for window, perimeter, etc)Hot!! wired active infrared detector (used for window, perimeter, etc)Features: 1.Intelligent Judgments:adopt double-beam ... 40ms,it can overcome traditional alarm detector's drawback of false alarm and ...