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The device loud-speaking "GU-20M" was produced since 1974 and is intended for loud directional transmission over a distance of 300 meters. The device works with moving objects (cars) and in stationary conditions. It can work from four sources of broadcasting and has 4 inputs: laryngophone, microphone, adapter and tape. The rotary mechanism of the device provides loudspeaker rotation by 175 degrees in both directions relative to the direction of movement. The device consists of two amplifiers "U-10M", a control panel and a pre-amplifier "GU-20M" and two loudspeakers of the type "GR-1". Technical data: The rated output power of each amplifier is 10 watts. The frequency range of the sound pressure 300 ... 3000 Hz. The coefficient of nonlinear distortion is 15%. The rated supply voltage is 12.6 V. The power consumed by the amplifying path is not more than 57 W. There is a tone control treble. Photos of the device "GU-20M" are taken from the Internet auction.