Ucharge S30-4 Solar Lights Crystal Ball String Lights 20ft 30Led Christmas Led Lights Waterproof (Warm White) This soalr lights charged by solar energy at daytime (just put the solar charger in direct sunlight), then it will automaticlly light up at dark With different function switch: on/off swich and lighting mode( steady or blinking) switch. Please insure the switch is turning on when charging this unit Simple assembling and operation: the solar panel stood by a 21cm spike. Waterproof: suitable for indoor and outdoor decoration Operating time: at least 6-8hours illumination at night after full day charged, no plug needed, safer and more eco-friendly than the same type of lights. A great decoration for your home,patio,garden,party,Christmas, indoor and outdoor, it creats a warm and romantic holiday atmosphere