You won't need to refill too often either, as each bottle is 10ml, AND has some of the best performing silicone in its class. Huge.
This bad boy also goes up to 90w of true output on a 21. Run any build too, as this one goes down to 0.08ohm, and puts out a respectable top of 8.5V!
The screen is a generous 0.96in long OLED, and the oversized fire button makes it super easy to hit in any position at all. You're doing yourself a disservice not having one of these in your arsenal, so get Topside for one of these before they've all moved out.
Mod is compatible with 18650/20700/21700 batteries.