Each laser-cut key is outlined in LED lights so users can see what they're doing, even in the dark.

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When you return to your room and reinsert your key in the slot, the lights awaken.

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All the lights go off when you take your key card out of the slot and depart the room.

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Sensors attached to traffic lights, lamp-posts and other city landmarks are seen as key to creating smarter cities.

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The car detects the proximity of the key and, just as you're about to reach the door, the lights come on and the door handles extend from their normally retracted positions.

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Key decisions on how to ensure there are enough gas power stations to keep the lights on when the wind is not blowing will be announced alongside the chancellor's Autumn Statement.

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We've never felt quite so welcomed as we have when walking up to the Model S. The car detects the proximity of the key and, just as you're about to reach the door, the lights come on and the door handles extend from their normally retracted positions.

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With a mechanical keyboard, on the other hand, each key press triggers an actual on-off switch a feeling as solid as flicking on the lights.

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