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The subscriber loudspeaker "0.25-GD-III" was produced by the Leningrad State Radio Products Plant from 1957 to 1963. The loudspeaker did not have any other name, as well as about the previous products of the plant, except for the type indicated in the marking, was a standard subscriber loudspeaker of the 3rd class and intended for a wire broadcast network with a voltage of 30 volts. The main part of the loudspeakers was made in standard dark brown color and almost always was completed with the back wall of dark gray or black color, on which a colored paper label with marking data was pasted. The devices were completed with different radio patterns in pattern and color. On the volume control knob there was a logo of the manufacturer in the form of a stylized letter "P". The dimensions of the loudspeaker are 190x160x90 mm.