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Subscriber loudspeaker "Liliput" was produced since 1925. This speaker is intended for individual use. The metal horn, consisting of the lower massive part and the upper lighter, is located on the base, inside of which the magnetic system is placed. The bent form of the horn with a wide socket achieves the best acoustic use. At the bottom of the base there is a disk, with a handle extending from the side, which serves to adjust the phone, which consists in selecting the loudest volume with appropriate radio transmission purity by changing the distance between the membrane and the poles of the phone. A telephone with a winding resistance of 4.000 ohms is a two-coil, slightly larger in size compared to a conventional headset; The diameter of the membrane is 75 mm. For connection to a radio receiver, amplifier or transmission line through a transition transformer or damping resistance, two clamps are used. The overall height of the speaker is 30 cm.