Cheaper to cast to a separate phone or tablet and then you can view both front and rear cameras at same time also.
This guy uses it to get a front facing camera and I'm considering it just for that feature.
Just seems like one of those - "hey check out this gadget" and "they don't want you to watch youtube on your car screen, but I can b/c of this sweet thing I bought" - but not really necessary or solving a real problem. (but, hey that's 90% of 'mods', so go for it!)
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