Please wash and dry the surface with alcohol to make no dust. Keep the bottom of suction cup is clean.
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Gently rotate the knob cap in an anti-clockwise direction until can not rotate. To check it is in pre-installed state.
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Push the suction cup perpendicularly into the expected place. To press the knob cap firmly to release air. ( At first installation, please remove the cover )
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Keep pressing the centre firmly, rotate lock to the right until hear a "click". Then pull the suction cup left and right for testing.
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