Two more newbie 2015 E350 questions, please
What's the little battery in the trunk (under the spare tire) for?
How do I remove the front floor mats? There are two round buttons near the seats. Do they unscrew?

When I press it a light icon lights up in the dash next to the other light icons, but I don't see anything happening.
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There's no easy way to turn off the radio, but there's a button that lights up to tiny red led lights behind the driver. I'm loving all the cool stuff this car can do.





