Mirka Deros MID550-912-10 5" Dust-Free System Kit with 33ft. (10m) Hose Variable speed control with lever, for an optimal control when working. Separate on/off switch, for easy and safe handling Separate on/off switch, for easy and safe handling Patented motor controller. Brushless motor, no need to change brushes, less down time. Constant speed under load, no loss in efficiency under heavy pressure. Soft start of motor, protects the surface. Continuous temperature monitoring in the motor and the controller card, prolongs the life time of the tool.