Feature: FUNCTION: Pulse width modulation(PWM) is used to make the speed more stable, and the strength is high at low speed. NOTICE: This is a DC brush motor controller, so 't use it on AC motors. WIDE USE: The speed controller is widely used in industrial DC motor speed regulation, DC fan, etc. EASY to USE: Adopt the motor of speed control mode, it has stable performance, the speed can be adjusted and it is easy to install. Specification: new Supply Voltage: DC 9V-60V Installation : panel type, and wiring according to wiring colour: black Material: metal + plastic size: . 99*60*90mm Package Contents: 1* 10A PWM Motor Speed Controller 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.