Key Box Battery Portable Vape Pen O Pen Vape Refillable Cartridge Battery 350mAh 3.7v Mods

1. 3.7V or Adjustable voltage 2.6 3.1 3.6V for cartridges with resistance over 1.2ohm, 3 clicks to change voltage, Capacity 350mAh. 2. New concept Childproof button battery 3. USB build-in , convenient to charge, no extra charger needed, charge it anywhere and whenever you want. 4. fold and flip up your cartridges, cartridge and charger can be hidden in the box, portable and easy to use. 5. fashionable look, long lifetime (300 times)