By using gyros, air driven by vacuum pump or an electromotor the (real) instrument keeps a stable position and indicates the 'movement of the aeroplane around the instrument'.
For more information about gyroscopic instruments.
The Horizon is available as slave instrument. A free port on a master instrument and an Interface Box is needed (see General concept).
The instrument is illuminated by (2) leds (optional), switched by the flight simulator.
