I'm not familiar with the Airmoto brand, specifically, but it seems that there are a multitude of small, electric air pumps on the market right now. They all seem to be pretty similar.

For a little while, I had a Ridgid 18V cordless inflator set up with a Silca presta chuck. It worked fine, but I got tired of the noise, and went back to using a floor pump. I also have a Fanttik X8 small, portable inflator that I got for cheap with a discount code, but I don't really use it.