Star Shower includes a light sensor to save electricity so it will only turn on in the dark.
This sensor is a photo sensitive spot so it stays on from dusk to dawn. But if you wanted to put it on a timer (remembering that the lights won’t show up during daytime) you could do so and cover the photocell spot with a black piece of tape, for example if you want to use it indoors.
For more info check out our Ultimate Guide to Laser Xmas Lights – http://laserchristmaslightshq.com/ultimate-guide-christmas-laser-lights/
Or our Holiday Projector Guide explaining the five highest quality and most affordable projectors on the market – http://laserchristmaslightshq.com/best-laser-light-projectors/