The sensor light identifies day & night automatically & will only illuminate at night, when movement is detected & Turns off automatically after 15-30 seconds if no motion is detected. Smart Motion Sensor Detection -- The Sensor Light has a built-in motion sensor that detects movement from up to 7-10 ft. away. Perfect for any Location -- This light can be used to light up your hallways, stairs, bathrooms, bedrooms, closets, storage areas & so much more. Wireless, battery powered operation means no installation hassles. No electrician is needed. You can install batteries into the unit, mount the light where you need it, & enjoy the safety & security of the unit's 50 lumen LED light. Specifications Power Source: Battery powered Motion Sensor Range: Up to 10 feet Lumen Output:50 lm Working temperature: -10 to 40 degrees Celsius Cool White Light Operating voltage: 0.8W Wireless, Battery Powered, uses 3 AAA Batteries (batteries not included)