1. uses advanced 5 to 6 tooth hosts unique tooth profile design allows the air return is small, high compression ratio to improve efficiency and reduce energy consumption. 2. intelligent control systems, importing Western cut electrical truly intelligent running. 3. coupling motor, host integration, eliminates the losses due to transmission of energy consumption, low speed reduces the noise. 4. humanized design, elegant and practical and unique clips and acrylic oil mirrors, removable filter, making management easier.