Very small, fits easily under the center armrest, which incidentally has a USB port, and works as soon as I get in the car. WiFi, but I'm not sure how it works, I don't read manuals, and the manual that came with it isn't very good. Nothing to write, easy to set up and it works. This is the only time I've used wireless car play, but I have to tell you, it's amazing when you have to use your phone for things like paying for Starbucks fares with Apple Pay. There is no noticeable drop in response speed, if any. Overall recommended. :D
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