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The Combine Emitter is a Combine device used as an indicator to any event, emitting a chosen light or sound. It can be placed on walls, elevators, or weapon holders.


  • Combine Emitters can be found in Combine-controlled areas, such as City 17.
  • The parts of the Citadel visited during Half-Life 2: Episode One make great use of Emitters.
  • Emitters are seen with their light facing downwards or upwards.
  • The light is colored differently depending on the situation:
  • When used as alarms, they blink a red light and emit sirens.
  • Placed on an elevator, they are silent and emit a blinking yellow light to indicate that the elevator is moving.
  • On weapon holders, they emit a green light and are also silent.

Behind the scenes[]

  • Its name comes from its model name, "combine_emitter01.mdl".
  • As holders, Emitters can also be seen holding idle City Scanners in the Half-Life 2: Deathmatch map dm_underpass. There they do not emit any light.


List of appearances[]