This 24 hour manual timer is simple and easy to use. Just simply set it once for when you want your lights to turn on and turn off. If you want your holiday lights to turn on at dusk and off 6 hours later then this is the timer for you. You can move the dial to set the lights to go on at dusk and off in 2, 4, 6, or 8 hours later. 15 amp rating (1250 watts).