The Zenco Duo is a high-quality Vapor Cup innovation that can create heavy sippable vapor using a variety of cannabis extracts or concentrates. The unit features a triple glass heating element right out of the box, which is great at vaporizing your solid cannabis exrtracts. This unit is also compatible with 510-Threaded cartridges. Similar to other Vapor Cups, it shares the 2-part base and glass system design but with a noticeable difference in external material quality when compared to lower-priced Vapor Cups. The Zenco Duo features a whopping 2200 mAh battery, which is relatively high for this category, and is very convenient for users that enjoy slower-paced or longer sessions.