Brown noise for a quick recharge when you need an hour of deep, restful calm between commitments. Brown noise is a deep, low rumble, a bit like a distant waterfall, that softens background noise. It runs for one hour. Use it for a nap or a quiet reset between commitments: set the volume low, close your eyes and let it run before you get back into your day. Even a short, quiet break can leave you feeling more refreshed.