You can control the On-Unit UI using the four clickable buttons on the outer ring of the UI. These buttons include: the power button, the right and left arrow buttons (for adjusting temperature and screen-specific functions) and the Home (O) button for navigating back to the Home Screen, and (while on the Home Screen) for transitioning to the Secondary Screen and Menu. The On-Unit UI contains a circular touchscreen, which may be used to navigate between modes (e.g. Heat, Cool), fan speeds (e.g. Low, Medium), and for other functions.