Maximum current: 60 to direct current: 40 A Input voltage: DC10-55V (equal to the nominal motor voltage) output voltage: linear under load Adjust the motor smooth no noise no vibration,with power indication,wide duty cycle adjustment range Using high-voltage MOS tube, three pressure 100V high-frequency low-resistance capacitors, automotive fuses Note: the digital display is the percentage of the total motor speed 0-100, not the actual motor speed Colour:Silver Material:Plastic, metal Package Contents: 1 x motor speed controller, 4 x terminals, 1 x screwdriver Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.