How does Keyless Entry work?

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How does keyless entry work?

Keyless fobs contain identity chips that are constantly listening out for radio signals broadcast by their car. The radio signals can only travel short distances – typically but five meters.

When you put your hand on the door handle of a keyless car (in some cases you have got to press a button), the car sends out a brief radio wave. If the fob is in range, it’s then triggered to reply to the car, sending out its code. The car recognizes this and unlocks the doors.

The process is analogous to start the car with a button and systems are usually advanced enough that they’ll only start the car if the key fob is inside. Increasingly, there are keyless boot opening systems, just like the one on the BMW 3-Series below, with sensors on the rear bumper. Waggle your foot underneath the bumper and therefore the boot will open automatically, without you having to touch the handle – handy if your hands are full.

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