I highly recommend this noise machine.   It is lightweight and portable, so it is perfect for bringing on vacation.  I like that it can either be plugged in or be used with batteries, so I can use it anywhere.  The noises are very soothing and the volume control allows for so much flexibility.  The rain noise is my favorite for sleeping, but all the noises are pleasant.  The only thing that would make this better is to have one of the sounds be lower pitched, with more bass.  You can't go wrong with this noise machine. [This review was collected as part of a promotion.]