Form and function come together in the O.pen vape variable voltage 510 thread battery.  This variable voltage vaporizer battery is equipped with 4 voltage modes giving you more control over your vaping experience- from mellow & flavor to rich & robust.  FEATURES: Iconic Edie Parker Flower print 510 thread battery  Voltage options: 2.4 V - 4.0 V Rapid charge in 20 minutes Draw activated (no need to press buttons while you inhale to use) USB charger included    INSTRUCTIONS: O.pen vape batteries are easy-to-use and operate. Simply screw on your favorite cartridge and pull for up to 8-seconds for the perfect puff every time.  For optimal performance, charge the pen fully before use.  Voltage options to fit your needs: Purple = Low Orange = Middle Green = High Blue = Dab mode  * Cartridge not included.