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Loud-speaking intercom "UPG" since 1980 produced a pilot plant NPO "Volna".
The UPG device is designed for two-way loud-speaking wire communication between two subscribers at a distance of up to 1000 meters.
Rated output power 125 mW.
Range of working frequencies 450 ... 3000 Hz.
Dimensions of one device 125x75x56 mm.
Weight 450 grams.
More details in the instruction manual.
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