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By certification 
This product support tf cards
specification is as belowed:
Power source:3.7V-6V Power output: 8 W Recording time: 120s Audible range: 350m Weight: 440g (without battery ) Dimension: (L)249mm*(D)150mm Functions: Talk/Record/Play/Siren/SD card
Battery: use 1 piece rechargeable battery or 4 pieces D battery
specification is as belowed:
Power source:3.7V-6V Power output: 8 W Recording time: 120s Audible range: 350m Weight: 440g (without battery ) Dimension: (L)249mm*(D)150mm Functions: Talk/Record/Play/Siren/SD card
Battery: use 1 piece rechargeable battery or 4 pieces D battery
