These sets were released in 1991 as a part of the Lego Space series. They belong to the M:tron faction, which was characterized by the red, black, and neon green colors. The M:tron sets were the first Lego sets to incorporate magnets.
6833 Beacon Tracer contains 34 parts and 1 minifigure.
6877 Vector Detector contains 56 parts and 1 minifigure.
