... is light automaticallyWorking condition: -20°C ~ +70 °COptional LED color: white, blue, warm white, green, yellow, red, pink, green ... and red, blue and red, blue and white, blue+red+green, blue+red+green+yellowAdvantages-- string light Intelligent photosensitive ... on or off, the battery can charge effectively ........ Solar Powered! String Light with LED for Chrismas holiday light