This six-foot long cable connects your Wacom One 12 (DTC121W) or Wacom One 13 touch (DTH134W) display to your computer via HDMI and USB-A for operation, and to an AC adapter for power. This is only necessary if your computer does not have a USB-C port or it cannot power the display on its own. One USB-C connection plugs into the display, one plugs into the AC power adapter, and the HDMI and USB-A connect to your computer. Requires an AC Power Adapter (ACK44914A), sold separately.