This is just to update reveiws since the lates one was several years ago. My family has used a sleep machine every night for years and have one in every bedroom of the house as well as in our children's homes. We first bought the Hammacher Schlemmer version, which runs like an old locomotive, but are a bit big for traveling. This machine is the second HoMedics version for us. I bought the first one in 2013 to take on the road when traveling. We now have one at home and one for me to pack for trips. There are a number of settings, though we prefer the waterfall as it is more constant and sounds more like wind. From 2013 until about 6 months ago I used the first one some 3-4 nights on the road, but have run it every night as a second sound machine in an adjoining room without a single problem. I would recommend this model for anyone who travels and, for us, it has held up to the test of time.