As you can see, it's tiny! I bought it with a number of accessories, and even with its waterproof case it's very light and easy to wear on its chest strap.
As a test I rode round my village on my scooter. The 'raw' footage looks superb, but when you load it onto YouTube the quality drops a bit, but is still OK. As this was a test, I've turned the sound off.
I bought mine (with some accessories) on Amazon
optional microphone and remote control.