Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Bad knob, all same volume

After loving my two Conair noise machines (both have lasted over five years!), I had to settle on buying this one for my third child. Worst mistake ever. Returned two to the store after the knob broke within a week on both of them. Now I have one that the knob is broke again AND the volume is shot. No matter where I set it, it is all the same volume: very loud. Very disappointing, stay away and get the Conair instead.