Thank you for your interesting. For different star c3, we have attached the circuit boards photo on the page, please check, here i will give you a instruction for our star
1) If you just want to work on cars, then choose star c3, for star c3, it has the following:
A: Super star c3, Item number SP45-B, this one will release new software on this month or next month
This one is the most expensive and best quality. It is original, software is updated on official website.
B. high quality star c3, Item number SP117
for all copy star c3, this one hardware is the high quality. Software is updated by HDD. if you want new software, you need to buy the lastest HDD to update
C. Normal quality star c3, Item number SP45-F
http://www.obdexpress.co.uk/wholesale/mb-star-c3-pro-with-seven-cable-fit-all-computer-for-benz-truck-and-cars.html This one quality is also good, because its price, it is welcomed by many individual users
2) If you want to work on cars and trucks at the same time, then choose SD C4, item number SP100-D http://www.obdexpress.co.uk/wholesale/mb-sd-connect-compact-4-star-diagnosis-hdd-d.html
This one software is updated by HDD too. truck diagnose function is better than star c3.
3) For 5 -10 pcs, can you tell me which one star do you want? i will calculate the total cost for you.