1,SPEED CONTROLLER: This speed controller has the advantages of compact size, wide speed range, and good mechanical characteristics. 2,PRODUCT DETAIL: Electronic DC governor is an electromechanical integrated product that is directly started by DC voltage, combined with brush and brushless DC motors, micro gear reducers, and speed sensors. 3,USE INDICATION: DC motor power that can be matched with the controller, 50W, 100W, 120W, 200W, 300W, 400W, etc. Please connect the Mand, M ‑ wire to achieve positive and negative rotation of the DC motor. 4,SHORT CIRCUIT PROTECTION: DC speed controller uses a built in fuse for overcurrent or short circuit protection. If blows, the controller should be replaced with a fuse of the same specification. 5,IDEAL REPLACEMENT: Wonderful replacement for the old and damaged parts, fine workmanship, attention to details, helps you improve the working efficiency! 1 x DC Motor Speed Controller Item Type: DC Motor Speed ControllerMaterial: ABS Input: 220VACOutput: 200VDCExternal Size: Approx. 100 x 60 x 114mm / 3.94 x 2.36 x 4.49in Opening Size: Approx. 81 x 53mm / 3.19 x 2.09in Installation Method: Panel screw installation Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.