Rosewill RSL-112 PIR Solar Security Light PIR motion sensor with detection range up to 18 feet. 3 x 900mAh Ni-MH AA batteries built-in batteries enable 1 Watt LED lights up Sheds, Garages, Green Houses. The high-efficient polycrystalline silicon solar panel charges built-in batteries during the day even in cloudy conditions. Waterproof and maintenance Free. Light duration per detection: 40 seconds.