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This products can be connected with external 12v power supply.
specifications:
Power source:6-12v can be connected with external 12v power supply
Recording time: 10s Audible range: 300m Weight: 375g Dimension: (L)249mm*(D)150mm functions: Talk/Record/Play/Siren
Battery: use 1 piece rechargeable battery
Best Quality Plastic Megaphone