The battery support is really top! Everything is just right, Certificate of Authenticity, Seriennummmer, processing. The K-Simer automatically and accurately detects the correct voltage for the resistance of the evaporator. Even with my not sub Ohm evaporators it produces a nice vapor and taste! The only "Not really disadvantage" is that he is not very economical my Liquids consumed, but just the top taste, ease of use, and quality workmanship! A thanks to Meisterfids-Paff !!!