Features of TwinB GT1 Pro: -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.