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Portable electro megaphone "Echo" from 1974 produced the Kharkov plant "Radiodetal". The electric megaphone is designed to enhance speech in a radius of up to 10 meters and can be used by guides, coaches, bus drivers and for other purposes. The electric megaphone consists of a microphone, a transistor amplifier, a loudspeaker, batteries, placed in a plastic case. Electromegaphone reproduces the band of sound frequencies 200 ... 5000 Hz. Its rated output power is 0.5 watts. Power is supplied from two flat batteries. The dimensions of the electro-megaphone are 190x100x60 mm. Its weight is 1 kg.