The controls of your Cintiq 13HD or Cintiq 13HDT include:
Customizable ExpressKeys™: Four keys on the front of the creative pen display allow you to set frequently used functions or keystrokes, simulate button clicks or modifier keys, or create automatic settings for a number of applications. See Customizing the ExpressKeys™ and About your Cintiq 13.
Rocker Ring: The four-position Rocker Ring allows you to further customize your functions. See Using the Rocker Ring.
Status LED: The Status LED should light white when the Cintiq 13HD has power and is connected to an active USB port for each of the following actions:
Click with the tool tip
Touch the active area with a pen, or with a pen or finger on the 13HDT