Model IISX Voice Activated Portable Aviation Intercom

I want to use this in a loud vehicle to communicate with passenger and listen to music when we are not talking. Will this product suit my needs?

is the intercom full duplex between driver and co-driver?

Does anyone know where i can find a trrs to ga adapter, so i can use a normal, 3.5mm headset with this?

Does this come with a usb adapter? i put a usb outlet in and not a cigarret lighter outlet.