This solar deck lights is completely solar powered, it use high quality poly-silicone solar panels convert solar energy into electricity through sunlight. Solar lights are IP44 waterproof rating, with hard ABS shell and high quality solar panel, waterproof designed to withstand rain, wind, or small snowy days. Solar deck lights build with automatic light sensor function, it can automatically ON at night and OFF during day. Solar deck lights are very easy to installation, it can be easily mounted either vertically or flatly on plane with 2 screws (included) or double-side adhesive（included).