The BLDC Driver 25W - 75 W features include: Operation: Sensored or Sensor less (120 degree Trapezoidal Current Control) Motor Type: DC Brushless Motors Input Voltage: 18V to 36V DC Rated Power: 25W to 75W Dimension: (1).Diameter: 90mm, (2) Available in several PCB Assembly versions or as a complete unit with heat sink and cover