High Quality: The product has stronger anti-interference, lower power consumption, longer service life, easy to install, with a wall-mounted mounting bracket, with a rotating ball or keyhole for hanging.Infrared (IR) sensor: Passive infrared sensor is an electronic sensor that can measure infrared (IR) light emitted by an object in its field of view. They are most commonly used in pirg-based motion detectors.Versatile Application: This motion sensor alarm is ideal to your property from unwelcome intruders. It can cover front doors, back doors, garages, sheds, outbuildings, etc., and can also be used for caravans and RVs.Wireless Design: It has a built-in PIR motion sensor, if any motion is detected, an alarm will be activated. No wire connection is needed, j.