this hard drive is installed on rear buttom of NTG2.5 Comand head unit . you have to take out empty sliver plate and  reinstall this hard drive on your comand system 

this hard drive is USA version.  shows USA & CANADA map only . 

once you installed you need to go dealer for reprogram, dealer will using Mercedes computer set/switch on navigation hard drive to your comand system ! 

ONLY Work on USA version NTG2.5 Comand head unit . ( NOT WORK on EUROPE OR AISA NTG2.5 SYSTEM )

This hard drive gps is test in the car working 100%.

Thank you for looking.