Marpac noise machine
We have used these for years.  Now, our grown children are addicted.  They work flawlessly and forever.  The Amazon seller shipped right away.  We have dual speed and single speed, and the single speed works very well since the sound &#34;volume&#34; is adjustable on both models.  Save the $10 extra for dual speed.<br /><br />UPDATE:  We take this on vacation.  Can't sleep without it.  They just keep working and working.....bzzzzzzz
Rating: 5 stars