Features: 1) If infrared sensor detects motion, the detector will generate the signal to the base unit 2) When the signal received, the base unit will alarm up and led will flash 3) Communication distance : 250m 4) Adjustable sensor detecting space 5) Detect area: 60 degree, 8 meters 6) Versatile mounting capability (you can mount the detector by the front door, window frame, driveway, walk path, backyard or anywhere you need) 7) The remote detecting system operate with the infrared detection technology