Support Forward/Reverse Rotation Control and Stop. The speed controller is made with high quality circuit board which ensures a longer service life. This simple and easy-to-use DC motor speed controller has an elegant appearance and stable performance. Adopt PWM speed control, accurate and stable. Well designed case can protect the controller board from damage as well as dissipate heat. Specification: Supply voltage: DC 12-60V Output current: 40A Colour:Black Material:plastic Dimension: 60*90*99mm / 2.36*3.54*3.9in Mounting size: 52*81mm / 2.05*3.19in Package Contents: 1 * DC 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.