SMT process, high quality. DC brushless motor driver board. With speed control function, 0.1V-5V speed voltage. Over-current protection and speed signal. Operating Voltage: DC12-36V Operating Current: less than or equal to 15A Drive Power: less than or equal to 500W Operating Temperature: -40~85 Celsius Humidity: less than or equal to 90%RH Over-current Protection: Yes Speed Signal: Pulse Speed Signal Speed Control Function: Yes(external potentimeter control) Colour: blue Material: PCB Size: 63 x 42 x 17mm Package Contents: 1 * Brushless Motor 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.