Designed to control engine speed with fast and precise response to transient load changes. The speed controller provides a series of protection the power supply is reversely connected. High and low speed conversion and fine speed adjustment. Multifunction: Automatic Parking Protection. High Speed . Full Speed Control. Parallel Function. Steady-state rate adjustment (speed drop) is adjustable. Colour:Photo Color :plastic Package Contents: 1X Generator Speed Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.