A Factsphere Sensor is essentially an advanced camera that relays live thermographic images and data to the pilot. It uses both an active/passive sensor for microwave band and visible light region in addition to acoustic pickup and a fire control use environmental sensor to provide the pilot with integrated information. They are usually protected under a retractable layer of armor. When retracted, it allows for greater system sensitivity.
Earlier Knightmare Frames, such as the Sutherland, typically possess a single Factsphere in the head of the unit. The Lancelot, the first 7th-Generation Frame, had two Factspheres affixed in its chest. Later models, such as the Vincent series, place one on each shoulder. Some later models have no visible sensors at all. Lelouch's Shinkirō has a single Factsphere mounted on its forehead without retractable armor, due to its Absolute Defense System. A similar scaled-down system can be seen on some special infantry (like Private Kururugi) as a HUD-like system used to relay video feeds, enhance low light visibility, and identify objectives. This infantry system is helmet-based and is located on the brow, using two periscope-like eyepieces that cover the eyes to allow viewing.