1. Built-in function: Navigation, USB/SD audio/video player, blueooth for hands-free phone call/music from phone, mirror link with your smart phone, built-in wifi for internet via phone personal hotspot.
If you want to modify the addition of an external microphone, add $7 and tell me before buying.
There are 6 configurations available for you to choose from. Please confirm the configuration you need before placing an order.