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specifications is as belowed
Power source:3.7V-6V Power output: 8W
Recording time: 10s Audible range: 350m Weight: 448g (without battery ) Dimension: (L)249mm*(D)150mm functions: Talk/Record/Play/Siren
Battery: use 1 piece rechargeable battery or 4 pieces D battery
8w Rechargeable Megaphones