A person, of the species homo sapiens, was a member of the First Order's stormtrooper forces stationed at Starkiller Base. This individual alerted Kylo Ren to a sensor activation within Hangar 718 and dispatched more troopers to check the situation.
The voice of this stormtrooper was provided by Verona Blue for the film Star Wars: Episode VII The Force Awakens. A post on StarWars.com by Matthew Wood verified that Blue performed this role.