What else would be needed to make this work?

[NW_Merc]

Mercedes W202 C-Class C280 Telephone Display LKQ:eBay Motors (item 390082696512 end time Sep-15-09 11:00:30 PDT)

Looks a very rare bit of kit....

 

[stevesey]

A very old phone?

 

[KillerHERTZ]

Time machine?

 

[NW_Merc]

I couldn't find anything about it on detali.ru maybe someone could help me out.