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Features: Motherboard size: 100*76*28MM; Shell size: 110*78*38MM Brand New and high quality Forward & Reverse: Support Regulation Method: Potentiometer with switch PWM frequency: 15KHZ Wiring Type: terminal Knob Rotary Knob: 100K(with switch) Suitable for: Brushed DC motor Bidirectional rotation: setting direction of rotation is optional, which means that accomplishes reversing the motor's direction Note: The digital display is the motor full speed percentage 0-100 non-motor actual speed Package Including: 1 x DC Motor Speed Controller