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Electro megaphone "ECHO-2M" was produced presumably since 1989 by the Kharkov plant "Radio detail". Designed to enhance speech and ensure normal hearing at a distance of 70 meters under favorable conditions. It can be used for servicing sports events, hiking trips, exhibitions, city tours, etc., and also as a sound amplifier when an electrical signal is fed to its input from a receiver, tape recorder, etc. Power supply 12 ... 15 V.