Best I've tried
I've purchased a few sound machines to be used while traveling and this one is the best by far.  It's small and can be used plugged in or with the rechargeable battery.  It has a wide range of different sounds and the sound quality is very good.  I was actually surprised by the number of different white noise and water sounds.  I would definitely recommend buying this unit for its function and great price.
Rating: 5 stars