D:2.0 standard model with power supply port 15cm E: 2.0 standard model with power supply port 50cm F:2.0 standard model with power supply port 100cm G:3.0 high-speed model with power supply port 15cm H:3.0 high speed model with power supply port 50cm
I: 3.0 high-speed model with power supply port 100cm
