It was once a tech level 7 spacesuit, with several additional features, including
1. A liquid-cooled climate-control system (p. 74),
2. A outer protective shell,
3. A life-support backpack (duration is 7 hours),
4. A short-range radio.
Since Luthor’s encounter with the Benefactor, the suit has been extensively modified with both mystical enhancements and tech level 11 technology. The parts apparently were taken directly from a dismembered Servitor. Unknown to most, the suit is actually powered by a trapped electrical entity. Psychics may sense the presence and its insanity, but may believe it comes from the wearer of the suit.
If one examines the surface of the armor closely, they will see tiny lines of inscription in an alien language.