ghd Duet Blow Dry is a 2-in-1 hair dryer brush designed to transform any styling routine for effortlessly sleek and bouncy blow dries. It features unique Heat-Air Xchange Technology™ that converts thermal energy from the air to thermal energy stored in the surface of the product to allow optimum and consistent heat transfer for no heat damage. The heated barrel provides consistent heat transfer from root to tip and has snag free heated bristles that allow of a flawless smooth glide without tangling the hair or causing breakage. The 2 heat sensors monitor the surface temperature 400x per second and are positioned on opposite side of the barrel to ensure the same temperature is maintained across the barrel.