Note to buyers If you have any questions, please feel free to contact us, we will reply you within 24 hours. When you receive the goods, if the product is damaged or dissatisfied, please contact us, please do not leave negative feedback, we will try our best to solve properly for you, thank you! Features: *The product is suitable for Dayi 2106/169 brushless electric wrenches. It has been tested before selling OK. *18V 21V Brushless Angle Grinder Drive Plate Polishing Machine Dayi *General Control Panel Size 5.2*6.2CM *Brushless sensorless angle grinder drive control board general *Control board drive voltage: 18V (5 strings of lithium batteries, fully charged 21V), power 300W. *The battery pack marked with 48V, 68V, 88V, 98V, 128VF or TV can be used, and its voltage is actually 18V (5 series 2 parallel 10 cells or 5 series 3 parallel 15 lithium batteries, fully charged 21V) . *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--- Press down the speed control switch so that there is no gap in the shell! Otherwise, there may be a buzzing alarm! *To prevent damage to the motherboard, please follow the requirements. Package Contents: 1*Control board or 1*Switch or 1*Control board + 1*Switch Note: The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. Note: 1).You satisfactory is our only prsuit. Your feedback is extremely important to us. 2).Please kindly leave us positive feedback once you're satisfied with your purchase. 3).Please don't hesitate to contact us if you're unhappy with your buy, we'll solve all the problems with you. 4)We have time difference,if you contact us, Please give us some time to solve your proplem. 5)As seller,we hope you can get the goods quickly instead of making you angry .We are far away from you.Sorry and Thank you _x000D_