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EM-12 1990
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EM-12
Electro-megaphone "EM-12" was produced since 1990. EM is designed to enhance speech at a distance of up to 300 meters and a siren. Rated output power 6 watts, maximum 12 watts. Powered by 373 batteries with a total voltage of 16 V. The duration of continuous operation from a battery pack is 10 hours.
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Information from collection of Valery Khartchenko