Pull air pump handle and pump it repeatedly until the vacuum indicator button goes completely down.

每次拉动手柄,真空显示钮(深蓝色)自动降低,直至完全平降即可.

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A vacuum indicator enables constant checking of the suction performance, and to detect possible clogging filter.

真空指示器会不停地监视吸尘过程, 避免堵塞或异常.

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