The RUST Igniter is a deployable fire-starting implement first made available during the Lunar New Year event of 2020. It requires 2 electricity to function and is most commonly used when attached to a Switch.
Once placed on a relatively flat surface and powered, the igniter will begin to emit sparks outward in a minor cascade of white light. Deployables that otherwise would require lightings such as Camp Fires, Fireworks, or Furnaces within the immediate vicinity will then turn on (or light) if not otherwise already ignited. The igniter will remain on and emit sparks until power is cut or it is picked up. It does take minor durability loss over time with use. Where applicable, igniters may also be used to re-light Beancan Grenades or Satchel Charges that have dudded, considerably safer and from a distance.
Finding an igniter is quite common from low-tier crates and barrels, as well as drops from both dweller NPC types. Players may purchase them directly from the Outpost monument at a cost of 50 Scrap, learn them directly, or invest considerably more scrap to learn them via the tier 1 workbench tech tree.