Instructions for use: one button switch and two of two steps of brightness adjustment;
使用说明：同一按键开关及明暗俩两档调节；
Button type needle distance adjustment device is suitable for production of multi types.
按扭式针码调节最适合式品种生产。
Button type needle distance adjustment device is suitable for production of multi types.
按扭式针码调节最适合式品种生产。
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