The SJCam 4000 is good, and you can modify it for an external microphone input. But I have to admit that I like SJCam's M10 better due to size. But both are excellent.
Yes, beware of clones of clones. I got duped into buying a clone of the SJcam from Evilbay. Haven't tried it and have been trying to return it, but seller is pleading for me to split costs to try it, so I might.
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