... 50-60Hz2) million negative ions/cm3 helps create silky smooth hair for a natural look 3) Ergonomic Design for long lasting ... ) 2 wind speeds,2 temperature settings, and cool shot setting6) Professional DC Motor, High Wind Speed,Long Lasting,Quiet 75 db ... operating noise.7) Concentrator will help dry the hair 20% faster8) Dual Temperature Fuse9) Approved by the highest electrical ...