I would highly recommend this white noise machine!  There are 6 different sounds.  I have 2 favorites.  The rain and the ocean.  You can set the volume where you want it.  It has a timer, which is a nice feature.  You can listen for 15, 30 or 60 minutes if you would like it to turn off at some point.  You can plug it in, or it takes 3 AA batteries.  This would be nice for traveling or if the power goes out.  It's very easy to use.  I love it! [This review was collected as part of a promotion.]