| Blue | Blue LED Displays |
| Clear | Clear Anodized Front Panel |
| ESE | ESE Time Code Output: An ESE Time Code output is provided allowing the unit to drive ESE Time Code Slaves. |
| 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). |
| P | 19" Front Panel (Rack Mount): Designed for mounting into a standard equipment rack. Panel is 1/8" black anodized Aluminum and chassis is 5" - 10" deep. |
| P2 | Dual Rack Mount: Allows specific units to be mounted side-by-side on a single Rack Mount panel. |
| Q | Console Mount: The unit is housed in an enclosure 8" deep, front panel is 3.5" x 9", 1/8" clear anodized aluminum. |
| Red | Red LED Displays |
| T | Tenths of Seconds: Tenths of Seconds LED Display added. Please order the LX/ES-166U when Tenths option is needed. |
| UL | "UL" Approved Power Supply: The unit is supplied with a UL/CSA approved wall mount power supply. |
| W | 3-Wire Power Cord: Recommended where static charges can occur. Standard on many units, otherwise a 2-wire cord is supplied.
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| Wall | Wall Mount Enclosure: Black powder-coated wall mount enclosure. Wall mount enclosure replaces standard housing. |