mb star c4 multiplexer tool for benz mb sd connect c4 xetry/das/hht/epc hdd car truck diagnostic scanner + cf-19 i5 laptouch screen

never insert batterries into the c4 multiplexer, even the screen shows" check batteries" the new generation for diagnostic equipment for all current and new coming vehicles as for china copy c4, you can use any la with sata hard disk instead of that heavy touch-screen computer. the new is better than c3 and it can connect mb internet to update and to programe and to set codes. it is including diagnosing, programming, simulation studying, repair information, automotive maintenance, technical service bulletin and so on..syi