To display the firmware version and model number on the: Turn on the power. Press the Enter and Surround buttons simultaneously. "Menu Expand" is displayed for the 3ES, 5ES, & VA555ES, or "Menu Specialised" is displayed for the 4ES, 7ES, & VA333ES. In the new menu, press > repeatedly until it displays the model and firmware version. The display is formatted like this: "D4ES U_CA VX.XX" where X.XX is the firmware version, U_CA is the destination code (USA and Canada).