Upon seeing that there are no more targets, the Sentry Turret will return to sleep mode after three seconds. When no targets are in visual range, the Sentry will scan the area in a sweeping motion with its laser targeting beam. They will begin to fire at any visible targets (usually Test Subjects, intruders or dummies). Upon visual acquisition of the target, the Sentry Turret will come to full alert, and the machine guns will emerge. The Sentry Turrets are armed with two dual machine guns, which can only be armed once a target comes within visual sight. At Wheatley's encouragement, Chell ignores it, but the Sentry Turret politely says 'thanks anyway' with a hint of shattered hopes. In one scene in Portal 2, an Oracle Turret is seen stuck inside the Aperture Science Pipe Network, who attempts to get Chell and Wheatley's attention. They will even forgive Chell for knocking them over. They have a strangely polite demeanor, which is in direct contrast with their deadly behavior. Sentry Turrets often speak in a sweet child-like, artificial voice similar to GLaDOS and a lavatory bowl within the Enrichment Center. Sentry Turrets are commonly seen serving as guards in the maintenance areas of the Enrichment Center, and during testing as an obstacle to the Test Subject. The Aperture Sentry Turret has a single red eye/sensor, a sleek appearance, and predominately white color scheme which is common in most Aperture Science technology.
