This is a nice little compact sleep sound machine.  I like that it can work on batteries or you can plug it in.  The 6 sound choices are all true to their description as we listened to them all.   We have tried this in our bedroom a few nights, and does provide a sense of serenity and peace, though sometimes some of the sounds seem a little loud even on the lowest setting, but not a deal breaker. [This review was collected as part of a promotion.]