Applicable: For ,for universal type Control board drive voltage: 18V (5 strings of lithium batteries, fully 21V), power 300W. Before testing the machine, you must first connect the wire- -fix the motor- -install the case- -tighten the screw- -make sure that the square shaft of the can be easily rotated without jamming- -connect the power supply- - Press down the speed control switch so that there is no in the shell! Otherwise, there may be a buzzing alarm! To prevent damage to the motherboard, please follow the requirement. 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:plastic Package Contents: 1 x Control board 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.