A Dyson engineer explains why the company spent $71 million and four years developing a high-tech hair dryer | TechCrunch
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Dyson Supersonic Hair Dryer Review: It's Expensive But Worth the Money
COSHARE SuperFlow1 High Speed Hair Dryer
Amazon.com : Hair Dryer with Diffuser - Negative Ionic Blow Dryer with 110, 000 RPM Brushless High-Speed Motor for Fast Drying, 1400W Low Noise Thermo-Control Hairdryer with Magnetic Nozzle for Home/Travel :
Dyson's hairdryer emits sound frequency beyond audible range