The Exxus Slim Auto Draw Cartridge Vaporizer is a pen style, simplistic battery unit. This uncomplicated device takes its easy functionality and integrates it with peak performance. The lithium ion battery is easily recharged with the included USB component. The attachment slot has a 510 threading which is a near universal standard within the vaping industry. Because the Exxus Slim is an automatic device, a few puffs starts the priming process for vapers.