A:AnswerThe Hero+ features 1080P/60FPS with Wifi and Bluetooth capability while the Waterproof model can only record 1080P/30FPS and does not feature Wifi or Bluetooth. However it does have low-light mode, as well as waterproofing.
A:AnswerIt all depends on the capacity of the SD card you put in it and the resolution you record on it.for example if you record @720 and 60fps it will allow you to record up to 2h 15 min in a 16g SD card. If you lower the resolution and the frames per second it will give you more time.
A:AnswerThere's no provision for external audio input. You could record via the built-in microphone and synch your high-quality tracks after the fact using a video editor.