For many of us, safety is a top concern. The Wireless Motion Alert system creates an expandable safe perimeter anywhere and is ideal for homes, businesses, worksites or any other property with no fencing. A base monitor communicates with a weatherproof outdoor sensor with an adjustable sensitivity control and alerts with light and sound when vehicles or pedestrians are approaching. It can support up to seven additional sensors (CWPIR) for a radius of up to 30 feet and can detect signals up to 1/2 mile away. This convenient safety and security system uses passive infrared (PIR) to alert with a unique light and sound pattern to identify which sensor has been triggered. Easy, wireless installation and programming make it simple to install anywhere. The kit includes one-year warranty, one battery/AC-powered base receiver and one sensor (CWPIR); additional CWPIR sensors sold separately.