Pocket signal light [3] in a durable metal case, painted in black. Presumably, it was produced in an unchanged form during a long period: from the fifties to the nineties of the twentieth century. It is intended for use by military personnel, however, in practice it is also used by airsoft players. It is powered by a 3336L battery, and has a retainer inside the case for storing a spare lamp. It is equipped with a device for attaching to a belt, a push-button switch without locking, a sliding lock for the latter, as well as two light filters (red and green) built into the front cover, which are brought to the glass for the output of the light stream with the help of levers.