Dimex 1876C-WH Solar LED Landscape/Paver White Light, 4 by 4-Inch Tile No electricity required, No batteries to install or change, Super Ultra-capacitor charges and discharges the crystalline solar cell Brilliant high quality white LED light bulbs, Rated 15 year minimum Charge even in cloudy weather, Charging time of 3 hours (sunny) to 8 hours (cloudy/rainy), Operation time of 12-20 hours when fully charged No assembly required, Light installs quickly with no wires, transformers, switches or fixture assemblies required