No in-car line-in/aux/bt? No problem! Testing a Xiaomi Roidmi 3S smart car charger 
It's a combo of an FM transmitter and a BlueTooth audio receiver, so you can pipe your music via BlueTooth over FM to your car stereo; really nice when your car stereo doesn't have a line-in. But, I'm not going to focus on that side of the product, plenty of videos and reviews that show how to use it. I want to know how this kajigger performs regarding output. It's also the first 12V 'cigarette lighter'-powered device I test.
So, let's find out what's what...
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