Special Features:

Illuminates yellow on top half red on bottom half; unlighted black background; accommodates four t-1 3/4 midget flanged base lamps; mates w/momentary action switch; legend reads: system test; major components: pushbutton 1, legend plate 1, color filter 4, actuator shaft 1, lampholder 1, pushbutton retainer 1, emi wiper 1

Properties:

Two or more different types of items having a common mounting or mounted on each other which together forms a portion of a switch but which in itself is not a complete functioning item and cannot be assigned a more definite item name. See also switch section, rotary and contact assembly, electrical.