Replied by Jolly on Oct 26, 2015
Thank you for your interesting.
1) We have attached the circuit boards photo on the description. please check.
2) Super star c3 software supports update online. While SD C4 does not support. SD C4 is more good at trucks than Super star c3. Firmware quality for super c3 is better than SD C4.
So if you mainly want to work on cars, want to keep up to update to work on the latest vehicles, then choose Super star c3.
If you want to work on cars and trucks,C4.