To operate you simply press timer only once. The lights will light up automatically 6 hours a day, every day at the same time, 30 day battery life. This set also includes 8 different lighting functions! LED light sets are battery-operated for indoor and outdoor use. All lighting sets are featured with the latest LED technology. These lights have 8 functions from steady-on to an array of twinkle and fading functions. Always cool to the touch.