Chamberlain Black/brown Aluminum/plastic Motion Sensor And Alert System

Features Transmits signal to base station up to a half - mile away Detection indicators with light and sound, distinguishable by sensor Expandable up to 8 sensors for total perimeter coverage. Many uses such as: driveway, patio, deck, storage shed, farm, office/worksite, and more Detects motion up to 30 feet away with wide 120 degree coverage Adjustable sensitivity controls help prevent false alerts Wireless, weatherproof design makes it portable for use inside or out Easy to install, use, and maintain Receiver powered by AC adapter (provided) four AA batteries enable battery backup mode and temporary portability for length of battery life Receiver features adjustable volume controls Sensor requires four AA batteries Specifications Type: Wireless