1,[Input and Output Voltage] Electric DC speed controller input is 220VAC and the output voltage is 180VDC. 2,[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. 3,[Forward Reverse Connecting] DC Motor speed controller can do forward or reverse rotating by connecting Mand or M‑. 4,[Good Mechanical Properties] This DC motor speed controller is with good mechanical properties and wide speed range. 5,[Simple Installation] This DC motor speed controller is simple for installation and use panel screw mounting. 1 x Motor Speed Controller Item Type: Motor Speed ControllerMaterial: ABSInput: 220VAC Output: 180VDCAppearance Size: Approx. 100 x 60 x 114mm / 3.9 x 2.4 x 4.5inOpening Hole Size: Approx. 81 x 53mm / 3.2 x 2.1inInstallation Method: Panel screw mounting 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.