New 4K60FPS waterproof sports camera WIFI touch remote control anti-shake camera outdoor sports DV black

SKU: GW41.0012

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You need an external microphone. 
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I see many videos review on youtube, in my mind that both of these cameras are basically same. I find there is a 30% discount on campark V30 and this is more cost-effective. 
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Yes...most of these action cameras is the gopro mounts 
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Good question-- I just recorded approx 42 minutes of video at that resolution and when I look at the files which comprise that video which are recorded in 8:31 minute segments the total combined size is 14.8GB so that can give you some idea. Hope its helpful! 
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Depending how long his bike ride is he may have to change batteries I am get about an hour of recoding at 1080p 60fps before I need to put a fresh battery in. 
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The camera comes with a waterproof case that covers the lens. 
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Read the whole specs and you will find out. I would only by Acaso from Acaso DIrect 
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Yes it is available but there is an option to correct it. Not so very much a fish eye look really. By the way a very good camera over all for that price! 
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The V50x comes with a skeleton case with a slotted rear door replacement, but there is no opening to allow plugging in an external mic. As a note, the sound recording, even while in the completely waterproof case, is better than I had expected. If you're not worried about moisture, there is a threaded tripod mount on the bottom of the camera and an adapter that will allow you mount the camera without using the case. 
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Honestly, the built-in mic is the biggest weak point on the camera. However, the upside of this camera vs the rest made it easy for me to ignore this. The external mic they sell is only $10 and sounds way better than the built-in mic on any other camera and the Akaso is still way cheaper after paying extra for a mic. https://www.amazon.com/dp/B07XDPMD3T