The ELO (Emitted Light Optic) is an optical attachment in Call of Duty: Black Ops III, Call of Duty: Infinite Warfare, and Call of Duty: Black Ops 4. It is similar in appearance to a Red Dot Sight, but with a less obstructive frame.
Call of Duty: Black Ops III
- "Emitted Light Optic. Iron sights with a floating point illuminated reticle."
- — Description
Call of Duty: Infinite Warfare
- "Emitted Light Optic with a floating illuminated reticle."
- — In-game description
The ELO returns as an attachment in Call of Duty: Infinite Warfare. It functions similarly to the previous iteration, but the reticle can now be customized. The ELO sports a new ability, as it also displays an ammunition counter for the current magazine. It also has a different reticle, featuring a yellow crosshair instead by default.
Call of Duty: Black Ops 4
- "Clear open sights with an illuminated post."
- — Tritium Sight beta description
The ELO, previously known as the Tritium Sight in the beta, returns as an optical attachment in Call of Duty: Black Ops 4. While it functions near identically to the previous iterations, however the reticle is colored blue by default, with the reticle's colour and appearance able to be customized.