sprki - It's the 40w vapor shark.
I'll have to check pbsardos youtube video about the technical aspects of how it functions. RMS + PWM is a nice combination. I wonder what the 20W uses for power regulation? The main reason why I purchased it was because I got it /w shipping for 33$ from vapormakers (cool US based company with some pretty good deals that helps redditers out a bit). That's nearly 10$ lower than the janky 20W hana clones, with a much faster shipping time for in the US. The 10W mini is slightly cheaper as well. I would have got the 10W mini, but I really like vaping at 11W (silly I know), and twice the battery life was worth the extra 2-3 dollars. I wish they had a floating or adjustable pin, but for a back up it'll be perfect. For bad weather/hiking I'd rather use a 30$ device over a 190$, so having a back up device isn't only for emergencies I am realizing.