It is a 20 watt bridge type amplifier.
The gas can is simply it's case and does not hold any gas.
I thought it was cool, but apparently its a little weird to walk around carrying a gas can :P
I've uploaded a few pictures and a video! Check it out!
If the video doesn't work, go to this link: http://www.youtube.com/watch?v=xy4GwoFEc_M&feature=youtu.be