Dodow is a light metronome device that helps you fall asleep naturally. It projects a soft blue light on the ceiling. You can choose between an 8 minute timer or a 20 minute mode. You follow the light rhythm with your breathing. It is based on yoga, meditation and behavioral therapy techniques to relax your mind and body. It turns off automatically at the end of the timer. It runs on 3x AAA batteries which I removed so the post office wouldn’t get angry at me. One of the photos I included shows the light on before I removed the batteries.