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Operating as a data storage device, the Wrist Halo prominently displays information such as text and maps by a hologram projected from the wrist. The Wrist Halo has also been used as a radar, alerting Aki to the presence of Phantoms.
Essentially, it is a prototype holo-distance-gauging device. The Spiritual Energy Positioning System, or SPS, scans for pre-programmed, specified spiritual energy reading by a SE sonar with a scanning radius of approximately 100 meters.