Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great sound machine!

We had been using a fan to create white noise for my toddler. It took up lots of space, so we decided to buy a sound machine. This one works perfectly. The volume goes MUCH louder than a fan on full blast, if you want to truly drown out everything. With his door open and the volume half way up, I can hear the rainfall noise from every other room of our two story home. The sounds are nice. It doesn't have a white noise setting, but I think the waterfall setting sounds like white noise. We keep it plugged in all night, so I can't comment about the timer, although I did think it was nice that it had three time shut off options, unlike most made specifically for cribside.