The GoPro videos of stunts you see are usually not narrated. That's because concentrating on the stunt takes talking into a mic out of the question. But say you're good at doing both, then Sena's new Bluetooth Audio Pack for the GoPro Hero 3 is for you.

There's a wireless mic to provide narration alongside whatever you're filming. The add-on will cost $100 and it attaches to the back of a GoPro, and it lets you capture audio from a Bluetooth microphone inside a helmet or a earpiece like a Jawbone. Check it out here:[Sena via Gizmag]