Just got my sound machine works really nice only noise outta the 6 of them is the white noise that isn't berry pleasant sounds like a t.v. station out of service...it has 6 natural sounds to mask the background noises.. you can set it to 15,30, and 60 min to automatically cut off or u can let it go all night powered by a ac adaptor included or 3AA batteries not included small enough to fit in a travel bag to take on trips [This review was collected as part of a promotion.]