| Blue | Blue LED Displays |
| Clear | Clear Anodized Front Panel |
| DC | DC Operation: Requires the unit to be powered from a DC source exclusively, typically +12 to +35 VDC. |
| Green | Green LED Displays |
| J | 220 VAC/50 Hz Operation: The unit is configured to operate from 220 VAC line voltage. 117 VAC 50/60 Hz is standard. |
| NTP-C | NTP Client: NTP Client Displays synchronize exclusively with an NTP server (replaces all standard inputs). Available on the ES-271U/9. |
| PoE | Receives 48V operating power via Ethernet cable.(available on the ES-271U/9) |
| Red | Red LED Displays |
| RS | RS-232C (or RS-422, if specified) Output: Computer Interface allows the time code data to be shared with a computer. (Available on the ES-271U/9) |
| UL | "UL" Approved Power Supply: The unit is supplied with a UL/CSA approved wall mount power supply. |