The astronaut projector features two intelligent timing modes. Set a shutdown timer of 45 or 90 minutes. These modes are perfect when you are using the projector at bedtime. Kids drift off to a pleasant sleep while looking at the calming starlight's. The projector shuts down after the timer runs out. It is also perfect for adults struggling to go to sleep. Turn this projector on and set a shutdown timer. Go to sleep looking at the starry night sky.