Four types of white noise sounds:- White- Brown- Pink- BlueWith volume control and timer. Choose the sound duration and don't worry, you can rest and sleep without having to stop the sound.It will help you sleep better and concentrate on your work or studies. Also thanks to those sounds your baby will rest better.If you or your child have a light sleep and have trouble falling asleep or staying asleep, The white noise may be sufficient to block outside sounds and the sounds of other people moving around the house. The sound of white noise can help to calm you down and help to be relaxed at the time of sleep.Many pediatricians recommend to parents to use the white noise to calm the crying and even colic of babies. The pediatric community recognizes the benefits of white noise to soothe colic, crying and help babies sleep better.Please rate it if you find it useful. Thanks!