Input voltage: DC9-55V Output voltage: linear under load Output current: 0-40A Speed regulation mode: potentiometer (linear speed regulation) Speed regulation type: potentiometer (linear) Speed regulation range: 0 - 100% Control frequency: 25KHZ Wiring type: fence type terminals Knob specification: 100K (148) Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Photo Color Material:PCB Package Contents: 1 x Motor 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.