I never though I would need a White Noise Generator, but my house is not asleep when I am anymore and hearing them roaming the house would wake me up. Not anymore, I can set any of the 6 sounds for 3 different lengths of time or let it go all night long. I now sleep till my clock radio goes off. This unit is very light in weight and can run on batteries or plug in. Great to travel with! [This review was collected as part of a promotion.]