Lel.
I was actually doing research on me own for the whole volts/amps thing, and I know that amps are the deadly stuff.
I just couldn't be bothered to write up the amperage. 
It has the same zapping power of a taser. So a few miliamps. 
It's gas powered, and it makes a *twift* sound. Not absolutely silent, but you wouldn't notice it if it was set off in the streets. The screams of agony would be what you would notice.