The HoneyStick BeeMaster Double Cartridge Auto-Draw Vaporizer is the first auto-draw vape battery of its kind. Its patents pending innovations give vapers an incredible amount of flexibility in the oils, concentrates, or other contents they want to vape from their prefilled 510 thread cartridges. While it has many great features, the most noteworthy feature of this vape unit is that you can put two different carts that can be filled with the same or different contents and draw from either one or both cartridges at any given time. The cartridges are held by magnetic adapters making them easy to switch and there are multiple magnetic adapters so you can mix and match your cartridges. Its batteries are conjoined yet can operate individually or together for either single or double cartridge vaping. If you are looking for an auto-draw vaporizer that gives you the flexibility to vape more than one kind of oil, concentrate, or other contents; or, if you are looking for a vaporizer that carries more volume of your favorite prefilled 510 thread cartridge; this is the vaporizer for you.