Name: Electric Chain Saw Control board. Color: As shown. Material: Plastic + Metal. Applicable: For Universal Electric Tool. Size: as the picture. Power: 55A. Before testing the machine, you must first connect the wire, fix the motor, install the case, tighten the screw, and make sure that the square shaft of the head can be easily rotated without jamming. Connect the power supply and 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 requirement. Package Contents: 1*Control board. Attention: There may be differences in wiring color, base plate color, or other aspects between the actual product and the linked image, but the functions are exactly the same.