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MASERs (Microwave Amplification by Stimulated Emission of Radiation) are the primary method of communication on UNSC starships. Factually, they are devices which emit microwave radiation. They were first referred to in Halo: Contact Harvest, where on the DCS-class freighter Tiara, the AI Mack used a MACER to destroy a fragment of another AI called Loki. They are effective short-range devices (planet to planet), but are too slow to be effectively used over longer distances. After the war they may have been improved to be used for long ranges and even within slipspace.