Features: The DC motor speed controller can control the direction of DC motor, CW/CCW rotation This motor controller board can adjust the speed of the motor by the speed control knob With emergency stop button, safe to use This speed controller support 6-30V voltage,and suitable for 37GB3525 brushless motor The motor speed controller has speed control knob, easy to operate Specifications: Voltage: DC 6-30V Size: 6.6*3.2cm/2.6*1.26in Weight: 17g Package includes: 1 x Motor Speed Controller Note: The controller is NOT reverse-polarity protected and will be damaged if connect the supply voltage with wrong polarity. Double check all connections before applying power and always turn off the power supply before making any wiring changes. Package List 1The DC motor speed controller can control the direction of DC motor, CW/CCW rotation 2This motor controller board can adjust the speed of the motor 3This speed controller support 6-30V voltage,and suitable for brushless 37GB3525 motor 4With speed control knob, easy to operate 5The motor speed controller has speed control knob, easy to operate