Easily detect movement in your home with the Uniden USHC-3 PIR Motion Sensor w/ 105 Detection Angle. This motion sensor is a passive infrared sensor that detects body movement from heat. The sensor features a 105-degree detection angle and a detection range of up to 40 feet. It s the perfect way to add additional sensors to your USHC41 HC54 or HC84 Smart Home Security Systems (System required).