Wireless Infrared Detector Motion sensor alerts can notify you of intruders or visitors. It will detect movement 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).Multi-function 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 hearing impaired.Easy installation The doorbell can be charged by USB or installed with batteries to work better. No wiring required, no installation hassle, self-adhesive installation, the detector is fixed to the wall. The infrared sensor can be rotated 360 degrees left and right and 180 degrees up and down. Extendable Wireless Pir Motion Sensor Each motion sensor detection alarm receiver 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 Sensor You can place the infrared sensor detector at the entrance, porch, porch, mailbox and place the receiver in your house. 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.