The motion detector uses wireless technology so you don't have to wire between the external detector and the internal buzzer; Fashionable product design that is exquisite and simple; We specifically request the factory to have a special fuse built into the receiver; In case of sudden ignition, you don't have to worry about short circuit or mini explosion The infrared sensor detects movement and sends a signal to the receiver; The receiving buzzer sounds and flashes when activated; You can know that the visitor enters your store without looking at the door; With high-quality sensor, no omission Adjustable volume and melody; 3 volume levels and 38 melodies optional; It can also be muted to indicate the presence of a visitor by simply emitting a light flash; The detector can be turned off to save energy when you don't use it Sturdy construction and easy installation; Do not use the product if the voltage is unstable or the product touches water, which may cause a short circuit The