Underwater Action Camera 21m Caseless Waterproof 4K 60FPS Video WiFi Connection

SKU: GW41.0114S1

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No, there’s no interface for an external microphone. This action camera features microphones and noise reduction technology, and it can capture sound. 
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Yes, both slow-motion and fast-motion photos and videos are available. 
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Yes, there’s a 1/4” thread hole on the button. 
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No, the rechargeable battery is built-in. 
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Yes, you can preview and shoot via the app on your phone. 
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It supports up to 128G micro SD card.