A small black metal signal light with a circular glass lens and a hinged metal protective cover. The device includes sliding red and green filters that move across the light to change color output. The casing features two silver knobs securing the filter plate, and a hook-style closure at the base for accessing the battery compartment.
A white adhesive label marked “99-156” is affixed to the back. The compact design and presence of color filters suggest use for field signaling, identification, or communication in low-visibility conditions.