Theory’s T-Pen GO is our flagship vape pen hardware, designed to work with our in-house glass CO2 cartridges. The T-Pen GO has an adjustable battery, and allows the user to prime the cartridge with heat prior to inhalation, which provides a stronger vaping experience. The T-Pen GO comes a USB charger. DISCLAIMER: Customers may request to view a copy of the Certificate of Analysis at our physical location. This product has been tested for contaminants, including Vitamin E Acetate, with no adverse findings. WARNING: Vaporizer Products may contain ingredients harmful to health when inhaled.