Brightsky LED Solar Motion Sensor SpotLight Wireless Detector Wall Mounted Outdoor Waterproof Lights Solar poweredno extra battery or electricity wire needed. In the night, motion sensor turns light on if someone passes byand turns it off automatically in about 22 seconds . IP65 Weatherproof design for durability Simple and wireless installation, different designs of mounting for installation: around a tree or column, stick on a wall, stand on a roof, tied in a fence, alongside a window, or hang on a gate...... Protect function prevents over-charge, over-discharge, over-current and short-circuit .When fully charged, the battery provides about 90 times of lighting if no more sunshine is available.