So a hair dryer I have never experienced before. The Goflball interface is pure nonsense. If you let the fans run unregulated, the noise is unbearable. You restricts him to 1000rpm, then it goes, but then the air flow rate is lower than for example in Arctic F12 PWM fan. Have him sent back, that thing is good for nothing, and low noise is a lie! In the words of one of the other 1-star reviews: this thing is fucking sound!