Push and hold the DOOR OPEN button if doors need to be held open, or ask someone to push the button for you.

按住常开按钮以使电梯门保持开启状态，或请其他乘客帮你按下按钮。

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Push and hold the WPS button on the side of the PTV3000 unit for more than 5 seconds.

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Hold down the green key, and the moment you let it go, you push the lock button.

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