3B (C4+GT1 PRO +MINI OPS) is a Almighty auto diagnosis for BENZ and BMW vehicles.
From the
TwinB Star C4:
1. TwinB Star C4 can be available for any kind of computer.
2. TwinB Star C4 has rs232/485 interface, which can connect with touch screen and also common screen.
3. TwinB Star C4 can work in the voltage of 12V/24V.
4. TwinB Star C4 can supply power to the computer by Power Cable.
TwinB GT1 Pro:
1.Self-protection: GT1 Pro Multiplexer will be turned off by itself if the voltage surpasses 15.8V during your testing, and it will restart if the voltage below 15.8V autometically.
2. TwinB GT1 Pro uses the newest software DK219.
3. TwinB GT1 Pro can also supply power to the computer by the interface of the LAN cable.
TwinB MINI OPS:
1. MINI OPS can test the lastest BMW vehicles.
2. MINI OPS is more stable than OPS. .
3. MINI OPS is in less size and weight, so it can save lots of shipping freight and it is convenient to carry.
Warranty: one-year product quality warrantyAfter sale service:1) Free update during one year2) Free repair and maintenance service within one year3) Free technical support by internet or via phone

Pls feel free to contact me if you have any questions,and i would try my best to help you .