Wireless Motion Alert System in black by Chamberlain;

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. 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. Simply secure: passive infrared (PIR) alerts with a unique light and sound pattern to identify which sensor has been triggered when vehicles or pedestrians approach, while allowing small animals to pass undetected Easy setup: no wiring is required and the base unit uses the included AC adapter or AA batteries (not included), which will last up to two years (NOTE: check user manual for technical specification before use) Proven quality: rigorous quality testing ensures lasting performance Product Dimensions: (D) 3.03 in. x (H) 1.77 in. x (W) 3.52 in. Additional assurance with 1-year warranty Includes battery/AC-powered receiver and one sensor (CWPIR) (additional CWPIR sensors sold separately) Chamberlain is the largest and most dependable garage door opener manufacturer in North America