Go Pro seems to be the standard. Check your local Wally World - the ones around here usually have them in stock. Drop a SIM card in, charge up the battery, and make sure it is not pointing down at your feet. (headband is the easiest way to avoid that but is pretty obvious)
The spy-ware cameras (clip onto your glasses ear piece, are part of your eyeglasses frame, etc) may have a shorter run time and/or less ability to store your video. But it will "force" you to look people in the eye.
Do check your local laws on videoing - it is often far more restrictive than audio recording. However, you are welcome to stretch the "public figure in a public place" concept as far as you want.