The Eleaf Istick 20w has:
This thing has spectacular packaging, very neat and tidy. I purchased the Full kit that came with the cable, power adapter, 510 adapter and manual. The professional packaging really gives the impression of a solid product straight away.
The istick 20w is small, real small. It measures 75mm*21mm*32.8mm, and fits very comfortably in the hand. The button position takes a little getting used to, as I automatically go for a top button (REO) but it has a nice feel to it. It is not really smooth, and there is a noticeable clickiness to it, it is something that can easily be ignored though.
They jammed an 18650 into this little device! Considering the size, that’s quite the achievement! It’s claimed that it has a 2200mAh battery.