HTC Aria key functions
AUDIO JACK Connect a 3.5mm stereo headset here.
VOLUME UP Press to increase 
the ringer or media volume.
VOLUME DOWN 
Press to lower the
ringer or media volume.
MENU
Press to open options for the current screen.
HOME
Press to return to the
Home screen.
MICROPHONE 
POWER
EARPIECE
TOUCH SCREEN
BACK
Press to return to the previous screen.
SEARCH
Press to search information on the Web or on the current application.
OPTICAL TRACKBALL Swipe your finger over to navigate on the screen.
USB CONNECTOR Connect the USB sync cable to transfer files or charge the battery.
