Wireless Infrared DetectorMotion 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 ChimesThe 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 InstallationThe 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 Motion SensorEach receiver of the motion sensor detection alarm can be used with up to 32 motion sensors and 8 remote controls. You can flexibly design the quantity of sensors and receivers according to your needs, which can be freely matched and set unique lights or ringtones with each other. Wide Application Motion SensorYou can place the infrared sensor detector at the entrance, porch, gallery, mailbox, and place the receiver in your home. It can be used as a doorbell, caregiver pager, burglar alarm, pet monitor, mailbox alarm, store welcome bell, it can be successfully used in your home, hotel, hotels, offices, warehouses, office buildings, etc.