INST Solar Powered LED String Light, Ambiance Lighting, 55ft 17m 100 LED Solar Fairy String Lights for Outdoor, Gardens, Homes, Christmas Party (Multi-color) This solar LED works by converting solar energy into electricity during the day, and it lights up automatically at dark. The volume of solar energy converted and stored everyday ,great and long lighting performance. Sealed process, with good waterproof performance. Suitable for indoor and outdoor decoration with trees, wreaths, etc. 100 LED lights STEADY and FLASH in a string, form a beautiful and fairy world.