The G-Pen Vaporizer from Grenco Science™ is an amazing product. The device vaporizes essentials oils instantly. Extremely portable, long battery life, easy to use/refill, simplistic, and effective! The Gpen has been the most popular selling vapor pen on the market due to its quality, reputation, and functionality. Don't settle for ANYTHING LESS than the Gpen. Keep it classy, you got to be a G with your new Gpen!