It has four buttons on it:
The first is a lock button. This one button does what all technology should, it makes my life better. The brilliance of this might not be readily apparent to everyone but it makes it so I never lock my keys into the car. On my old van the easiest way to lock the car was to hit a button inside the car. This made it all to easy to lock the door, close it, than realize you don't have the keys. With this button on the jaguar I am outside the car and have the keys every time I lock
The second button is an unlock button. It is nice but unlocking cars was never hard so the net benefit to my life is only slightly positive.
The next button is a panic button. This is Annoying and has no real use but does nothing worse to my life than make me yell at my car when I accidently hit it. People ignore car alarms but pay attention to people yelling help. So I would never actually would want this feature.
The last button I could easily be talked into paying at least a hundred dollars to disable. It is the open trunk button. Sounds harmless enough, right? Actually it just cost me a few hundred dollars and almost certainly will again. Let me explain. The first thing to understand is that it doesn't actually open the trunk, it unlatches it. The trunk stays closed until someone lightly pulls up on it. The insidious part happens when you accidentally hit it, the trunk is now ready to open but you have no idea. Being unaware you drive away with an unlatched trunk. Then when you hit a big enough bump it opens, often causing you to lose whatever happens to fall out before you
noticed it. This just happened to me on the freeway while going eighty with a trunk full of text books and binders of notes. I spread papers over a several mile section of road