Use the high torque dc brushless motor, speed raising and reducing quick and reach the max speed in 18 seconds with the micro rotor, no need to maintain, no powder pollution.\n \nwith the function of automatic rotor identification. microprocessor control, tg16 digital display, tg16c crystal display, operated by programming, convenient in operation, 10 kinds of program stored in memory and 10 kinds of raising and reducing speed for your choice. electronic lock, over speed automatic protection, 3 tiers protection steel cover, safe and reliable.