ALEKO DWA001 White Safety Driveway Patrol Infrared and Wireless Home Security Alert Alarm System Kit Protect Home Garden Garage Shed Business Warehouse Aircraft Hangar Secret Place Space And Anywhere That You Need, Protect Your Privacy This Battery Powered Wireless Driveway Alarm System uses a new smaller infrared PIR Sensor that detects people and cars up to 20 meters away and then transmits a wireless signal back to the receiver up to 100 meters away, often used to protect farms, Shed, driveways, gardens, perimeters etc Portable receiver has three settings: high or low chimes and off The fully Weatherproof PIR ( In line with IP44 waterproof standard) has a 20 meter long single sided infrared beam which is very simple to install and due to the narrow designed beam will avoid picking up small animals passing by on the ground Once detected this will send a signal to the receiver (which can be placed upto 100 metres from the transmitter) and an audible alarm will be sounded to alert you to somebody approaching. You can set the volume of the alarm, the loudest being 90 decibels - which is loud! There is also a flashing Red light that alerts you as the alarm is sounding