Wireless Infrared Detector Motion sensor alerts can inform you of intruders or visitors. It will detect movements and send a wireless signal to the receiver, so you can always understand the situation and ensure safety. The detection range of the infrared sensor is about 13-26 feet (4-8 m), and the maximum working range is 918 feet (280 m). Multifunctional Sensor Chimes The sensor has Welcome / Alarm / Doorbell / Color Light and Night Light modes. 36 ringtones in doorbell mode to meet your needs. 4-level adjustable volume/brightness, mute and color modes are suitable for the hearing impaired. Easy Installation The entry chime can be charged by USB or installed with batteries for better operation. No wiring required, no installation worries, self-adhesive installation, the detector is fixed on the wall. The infrared sensor can rotate 360 degrees left and right and 180 degrees up and down. Expandable Wireless Pir Motion Sensor Each receiver of the motion sensor detection alarm can be