Easy to use with no mains wiring these beautiful christmas tree lights are powered by solar energy they automatically turn on at dusk amp off again at dawn and have two functions constant amp flashr 12 lines of string lights extend from a central ring each line has 20 leds amp is 19m in length so suitable for a tree up to about 6 feet in height simply place the light ring over the uppermost section of the tree release the tie on each line and allow the lights to cascade down