The LectroFan has 20 total sounds: 10 white noise sounds and 10 fan sounds. It only has three ... to bring their white noise machine when they travel. What I don't love: There's not anything ...

similar to a fan whirring before bed or rain tapping on a window. You've probably heard of white noise, or maybe even pink noise, too, but brown noise is slowly becoming more and more popular.

From the fuzz of a de-tuned radio to the replicated drone of an industrial fan, these little gadgets emit white noise sounds to help you drift off to dreamland. Noise machines vary from little ...