Features [Input and Output Voltage] Electric DC speed controller input is 220VAC and the output voltage is 180VDC. [Working Process] Electronic DC speed controller is a direct start with DC voltage, with the motor, miniature gear reducer, speed sensor and the composition of mechatronics products. [Forward Reverse Connecting] DC Motor speed controller can do forward or reverse rotating by connecting M+ or M‑. [Good Mechanical Properties] This DC motor speed controller is with good mechanical properties and wide speed range. [Simple Installation] This DC motor speed controller is simple for installation and use panel screw mounting. Specification: Item Type: Motor Speed Controller Material: ABS Input: 220VAC  Output: 180VDC Appearance Size: Approx. 100 x 60 x 114mm / 3.9 x 2.4 x 4.5in Opening Hole Size: Approx. 81 x 53mm / 3.2 x 2.1in Installation Method: Panel screw mounting Package List: 1 x Motor Speed Controller Package List 1 x Motor Speed Controller