Usage Tips: Feature: FUNCTION: Pulse width modulation (PWM) is used to make the speed more stable, and provides high torque at low speeds. NOTICE: This is a DC brush motor controller; do not use with AC motors. WIDE USE: The speed controller is widely used in industrial DC motor speed regulation, DC fans, and similar applications. EASY to USE: Features a speed control mode with stable performance, adjustable speed, and easy installation. Specification: Supply Voltage: DC 9V-60V Installation Method: Panel mount; connect according to wiring diagram Color: Black Material: Metal + Plastic Size: Approx. 99*60*90mm Package Contents: 1 x 10A PWM Motor Speed Controller (Only the above package content; other products are not included) Note: Lighting and display settings may cause slight color differences between the image and the actual item. Measurement error allowed is +/- 1-3cm.