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 head can be easily rotated without jamming---connect the power supply--- 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.