The light is powered by solar energy through solar panel; The solar panel converts sunlight into electric energy and then charges built-in 揂A擭i-Cd rechargeable batteries during the day. A light sensor turns on the light automatically at night. The light has two functions, lighting and killing mosquitoes. The light can work up to 8 hours at night under lighting mode and can work up to 6 hours under pest killer mode at night after a full sunny day charging. Remark: The lifetime of LED lamp is over100, 000 hours,you never need to change it. Plastic material Unit Size: Length(18.5cm)譝idth(18.5cm)譎eight(101.5cm)