No need for power generators or inverters with bulky car batteries. This handheld unit runs on 18-20VDeWalt, Bosch, Makita, or Milwaukee batteries, allowing you to treat several hives on a single charge.This model includes a NEW ProVap dispenser, an integral part of the vaporizer. You can now adjust the amount of oxalic acid you’re vaporizing into the hive from 1-4 grams with a simple twist of the dispenser dial! With the included dispenser, there’s no need for flipping of the vaporizer to get the oxalic acid into the heating vessel! There’s also no measuring of the oxalic acid.