The power button:
For the 310, the raised edge around the power button is black.
For the 310R, the raised edge around the power button is blue.
Note: Both the 310 and the 310R feature blue LEDs when powered on.
The label on the back of the workstation display:
For the 310, the Model reads MICROS Compact Workstation 3 | 310.
For the 310R, the Model reads MICROS Compact Workstation 3 | 310R.
Parent topic: The Compact Workstation 3 Series