LED Durawise is a battery-operated lighting set for indoor and outdoor use. No electricity socket is needed. So no hassling with cables and extension cords. LED Durawise works for 30 days on one set of batteries. Press timer only once. The lights will light up automatically 6 hours a day, every day at the same time. This strand of warm white bulbs has a black cable and includes an 8 function controller. The strand is 24 feet long and includes 96 lights spaced approximately 3" apart. Requires 3 AA batteries (not included). Burning hours per set of batteries is 90 - 180 hours. Bulbs are non-replaceable.