外部调整旋钮。
所述的上盖体和厚度调整旋钮表面设置 有方格状图案，上盖体的一侧设有手柄。
The surfaces of the upper cover body and the thickness adjusting knob are provided with square pattern, and one side of the upper cover is installed with a handle.
利用两侧的调整旋钮调节按摩仪的松紧，根据旋钮边的数字确定两侧平衡，以适合头部大小略紧为佳。
Use the buttons at both sides to adjust to the comfortable tightness, according to the displayed digits at both sides to get the balance, a little tight will be better.
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