The new Yocan Evolve Plus is a larger, more powerful vaporizer pen for herbal concentrates, that delivers clean and potent hits from the QDC dual kanthal coils with quartz posts. A threaded coil cap confines the concentrate inside the atomizer and maintains the ambient temperature around the coils, aiding wicking and preventing leaks. The 510 threaded 1100mAh battery base charges via a micro USB connection and houses a silicone lined dish in its base. Heavy users can expect to charge the battery at least once a day. Note: the concentrate used must be highly viscous or solid. There is no resevoir for liquid - simply an exposed coil, with an airflow valve underneath. Thin oils or liquids will flow through the coil, and leak out of the device.