Old guy. Very Discreet has O-Pen Vapor Pens in Manhattan. O-Pen uses the latest technology. These pens are CO2 - No more butane. Pens come with two FILLED cartridges. They charge by USB. Choose Sativa, Indica or Hybrid, or any combination. REFILLS available ANY TIME you want them. Smoke anywhere, discreetly. Upscale, Manhattan clientele only.