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I heard this system from one of my friends, he said that it only takes 30 mins to upgrade the key to a totally intelligent one, the upgrade gives greatly comfortable experience to me.
The system can save you from lots of troubles, like finding the key and pulling it out. It can perform accurately such actions as lock the doors, raise the windows, fold the rearview and give intelligent tips. You will not need to pull out the remote when opening the car, it can unlock automatically when you come towards the car, and lock the doors, raise the windows, fold the rearview and give intelligent tips automatically when you leave. Once having this experience BMW X3 intelligent keyless entry system cannot use the traditional system anymore. Now the system is suitable for all-class Mercedes-Benz, BMW, Audi, Porsche.
http://www.vberikey.com/