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The proximity key is using radio pulse chip to communicate with the car computer and making use of it actually allows the driver the privilege of keeping the key fob in his/her pocket or in a purse while locking, unlocking or even when starting the car.
As a means of extra precautions, a mechanical key back up is usually provided with the keyless entry device in the form of a spare key blade in most cases concealed behind or inside a cover plate. In most cases your proximity key has an emergency key blade which can be used to lock, unlock or start your car, the essence of this emergency unit attached to the remote is to grant you access to your car on the off chance that your smart key battery ends up plainly exhausted. However, some cars have been modified in a way that they can be started mainly with the use of a transponder chip placed inside the proximity key. In order to detect the transponder key, the key must be held in the designated areas which make the transponder detectable.
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