HueLiv Outdoor Solar LED String Lights, 6M(20ft) 30LEDs Crystal Ball Fairy Lights (Multi-Color) SOLAR ENERGY POWERD BY THE SUN: no electricity required, save and eco-friendly. SIMPLE INSTALLATION & OPERATION: do-it-yourself with no special tools required; Two working modes: continuous & blinking. AUTOMATIC LIGHTING: integrated light sensor turns on the string lights automatically when it gets dark, and turns off the lights at daytime. OUTDOOR FEATURES: water resistance level IP44 (protection against splashing water from any direction), suitable for indoor and outdoor use. LONG WORKING HOURS: the lights can last for up to 8 hours continuously after each full charge.