Fine workmanship and secure performance. Durable in use. For vehicle truck fan heater control. Can used for fan, vehicle heater fan, Defroster . Operating voltage: 12/24 V Current: 10 A Arbitrary crimson : energy 12V or 24V + The diversified red: motor + Blue: motor - Black: energy - Control speed range: 0-100% Material: Plastic + Metal colour: As shown Package Contents: 1 x Motor Speed Controller Switch Only the above equipment content, varied merchandise usually are not included. Note: Light and diverse reveals may cause the color of the article within the picture a chunk varied from the real thing. The length allowed error is +/- 1-3cm.