Phoenixnet Water Drop Solar Fairy String Lights 19.7ft 6 Meters Solar Christmas Lights 30 LED for Gardens, Homes, Weddings, Christmas Parties, Waterproof (White) The solar fairy string lights use high efficiency solar panels, which can convert solar energy into electric energy and stored in the built-in battery. Unique optical technology can guarantee the lamps and lanterns (when brightly light) automatically charge during the day, and in the evening (when insufficient light) automatic light up. Solar powered panel is stood by a 20cm garden spike. With 2 switch, one is Mode (Flashing mode convert switch), another is Power On/Off(After switch turned on, can automatic light control and charging). The water drop solar string lights are widely used for decorating roads, yards, windows, shops, halls, stages. They are great choices for Christmas, Holloween, parties and weddings.