Infrared sensor

Infra-red sensors are a type of security device in military/top-secret installations. It utilizes the use of infra-red light beams as a manner of attempting to halt intruders. The beams are linked directly to the facility's central command computer. If an intruder manages to touch the beams, an alarm will sound and the personnel will be notified. There are two kinds of Infra-red sensors: A stationary version where it stays the same, and a patterned version where the sensors often change directions so as to dissuade the intruder from crossing.

Outer Heaven has utilized these forms of sensors in its fortress. Zanzibar Land also utilized these in the complex. Shadow Moses Island also briefly had them, only the result of tripping the alarm also results in releasing poisonous gas.

A common way to see the sensors is through Infra-red goggles or via cigarette smoke.