The Versaframe Quik-Test Pilot Light Cat No. 73-4 by Design Products Corp is a green indicator lamp designed for interior use in a variety of commercial and industrial applications. It features a panel surface mount style with a 125-volt DC plug type, suitable for controlling electrical equipment panels and instruments. The pilot light operates with an on/off control style and is illuminated for easy identification. Made of ABS plastic and ceramic materials, this unit is reliable and efficient for ensuring proper circuit function in control panels.