WYZworks Solar Fairy String Lights LED DRAGONFLY (Multi-Color) - 20 LEDs Easy to use: workable straight out of the box. Solar panels and DOES not require a battery which means NO electricity cost. Extra long running time: Can continuously work for 8-12 hours after proper amount of sunlight has been absorbed. Waterproof and weatherproof: makes this suitable for both outdoor and indoor use. 2 Modes: Flash and Steady ON/OFF/Flash button. Length 15.75 ft / Lead Wire 5 ft / LED spacing 6.5"