F91R Ultra HD 4K 60fps Action Touch Screen Underwater Waterproof, WIFI Video Sports Camera

SKU: GW41.0006

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make sure the card is not larger than 64 gb , also use the camera menu to format the card no your pc 
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It continues to record as long as the battery is charged and memory is available 
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I believe so, however, I have not set mine up yet, so I can't say for sure. 
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If you are intent on keeping the camera, just delete the files from the SD card via your PC. 
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Any hand held or mountable 3 axis gimble should work fine. Don't by a real cheap one though. Rod