AW: Yes, highly recommended. The set content of the Z-E2055 does contain an external Bluetooth microphone, which can be freely counted in the vehicle cockpit.

Another option is to use the separately available Z-EACC-BTMP set. Which is a phantom power supply for the OE BT microphone of the vehicle (usually mounted in the roof area). For general voice intelligibility, this is the best option but also comes at around 50 Euro investment.