What is this stuck to my windshield?

I bought my car a couple years ago and didn't even notice this antenna or receiver stuck to the corner of my windshield.




Trying to find out what it is so I can make some sort of use of it. My car is a 2003 Audi Allroad with the stock stereo if it matters. There was also some wiring with a flat connector in the glove box, when I pulled on the wire that led through a hole the other end with a blue connector popped out, I'm guessing they're related... I always figured it was some bluetooth receiver but nothing comes up when searching for a signal.



Thanks!

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I knew it!


No remote start. Was just given the stock key fob when I purchased it with no mention of remote start.

I guess I need to clarify, I should have said I didn't notice it when I purchased the car. Most people don't actually notice it, as it is pretty small. Never really cared much to figure out what it was since I bought it.

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