A:AnswerYES, depending on how you have it playing through your radio, if pluged into an AUX jack then you set your radio to AUX, if you are using Bluetooth then your radio should either be set on Bluetooth or changed to that.
A:AnswerYes it will. Plug it into the USB port for power and connect with Bluetooth to the car. It then works over the cars speakers for calls, your music and anything else you use Alexa for.
A:AnswerYes I have an 08 MB with no Bluetooth capability and plug this right into my Aux port and have instant Bluetooth with Alexa. Everything will play through your car speakers when connected.