I'm always surprised how many people need a fan on to go to sleep. But I'm also not surprised. A Fan gives comfort and consistency. It is constant and giving. This fan is the ultimate MP3 Downloadable Fan to sleep to. Enhanced with audio effects and brainwave entrainment technology, you will find this might well be the best fan you've ever had. My clients just love it. This Fan has virtually everything in it, brainwave entrainment, binaural beats, doppler effect and the kitchen sink. I dare you to listen to the whole thing, I've never had anyone make it all the way through. What this brings you is a wonderfully comfortable and familiar sound and adds technology to make you go to sleep. This is absolutely one of the best things you could ever wish for. Everybody who orders this sleeps.