What are you going to install into your Mercedes B-Class (2nd Gen) W246'
(we need this information to establish the correct parts needed)?

MERCEDES B CLASS (W176)

COMAND NTG 4.5 (2012-2015)

Comand NTG 4.5 features in the B-Class (W246) from 2012 until 2015, when it was succeeded by the NTG 5.1 Comand System. It consists of a 7 inch screen and a keypad on the main head unit.

COMAND NTG 5.1 (2015 ONWARDS)

Comand NTG 5.1 is part of the Mercedes NTG 5 Comand series and features in the B-Class (W246) from 2015 onwards. It consists of a 8 inch screen and unlike newer NTG 5 versions still has a keypad on the main head unit.