Hello FC'ers, this is a free, window version Thermovape revolution and a Ego-c twist adjustable voltage power source. The rev. is brand new, the ego-c adjusts from 3.2 volts to 4.8 volts to let you find the perfect level for getting the most from your rev. Too many devices 'round here so this goes out to share the love....... Newer members only please, less than 200 posts, first in wins! Thanks FC!