I use the DRIFT HD170 camera. I have the older version that doesn't have the connectors exposed, but rather has them behind a water proof DOOR. That means that when I have the external Microphone connected, the rear water proof door is open. I just have to remember to disconnect and close it if I encounter any rain. I mount it to the right side of my helmet, and have an external microphone plugged in and tucked inside my helmet so there's no wind noise, and the sound is WAAAAAAY better than ANY of these "sport cams" can offer, brand not specific.
What I also like about this camera is the ability to rotate the lens so that the image being recorded is not tilted in any way. I like mounting it to the helmet, and not stationary so I can record what I'm looking at and not making a boring video of the yellow road stripe or the like.
I ride a GOLDWING all the time now, and I usually have my wife with me and the intercom going. With the microphone tucked in the helmet next to the intercom speaker, I can record conversation and sometimes music too.
The DRIFT camera has a remote control that you wear like a watch. Battery life is amazing, and you can pop in and out the battery in seconds, so I keep a charged spare all the time. Charges up with a USB cable, and comes with other cables to hook up to a TV with a HDMI connection.
DRIFT has come out with improved versions since I bought mine over 5 years ago, and I recommend them. 2 thumbs up.