SPEED CONTROLLER: This speed controller has the advantages of compact size, wide speed range, and good mechanical characteristics. 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. USE INDICATION: DC motor power that can be matched with the controller, 50W, 100W, 120W, 200W, 300W, 400W, etc. Please connect the M+, M – wire to achieve positive and negative rotation of the DC motor. SHORT CIRCUIT PROTECTION: DC speed controller uses a built in for overcurrent or short circuit protection. If blows, the controller should be replaced with a of the same specification. IDEAL REPLACEMENT: Wonderful replacement for the old and damaged parts, fine workmanship, attention to details, helps you improve the working efficiency! Item Type: DC Motor Speed Controller Material: ABS Input: 220VAC Output: 200VDC External 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. 1 x DC Motor Speed Controller. We will reply your message within 48 hours. If you do not receive our reply within 48 hours, pls. Post a message again because sometimes our message system may block some emails. If you are satisfied with our service, pls. Our aim is to provide Level Customer Service, your recognition will encourage us greatly and serve you better. We strive to keep all our customers satisfy. We will do our up most to exceed your expectations in customer service, communication and dispatching of your orders.