Treetime's LED light sets are battery-operated for indoor and outdoor use, with the latest LED technology. No electricity socket is required so no hassling with cables and extension cords! LED Durawise works for 30 days on one set of batteries. To operate you simply press timer only once. The lights will light up automatically 6 hours a day, every day at the same time. This set also includes 8 different lighting functions! 1. Combination 2. In waves 3. Sequential 4. Slow glow 5. Chasing/flash 6. Slow fade 7. Twinkling/flash 8. Steady on