Perhaps a stupid question: What do I do if the battery in my mobile runs out? Is it still possible to open the door from the outside with a key or is that not possible because there is already a key in the lock from the inside?

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Locks with emergency and danger function are recommended. With these, the key can be inserted on both sides

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It also works with cylinders that have a rotary knob on one side. You simply need the appropriate adapter (Kaba, Keso etc.).

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The device should only be used with locks where a key can be used from the inside and outside at the same time.

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Question about Nuki Smart Lock Pro (4th Gen) CH cylinder

Perhaps a stupid question: What do I do if the battery in my mobile runs out? Is it still possible to open the door from the outside with a key or is that not possible because there is already a key in the lock from the inside?