Thank you for your query.
Firstly, we want to recommend reading the description of FMB120 unit and its usage possibilities on our Teltonika WIKI page: https://wiki.teltonika-gps.com/view/FMB120 If something will unclear or you will have any questions about this device, please feel free to ask.
Talking about CAN adapter price, please consult with our Sales managers which will answer to your all questions about it.
If you don't have any contacts with our Sale managers, please contact with them on our official website https://teltonika-iot-group.com/
and click on "Contact Us" button. When you will click, please fill the form and submit it.
Note: as a topic, please choose "Vehicle telematics".