The SMOK OSUB One 50W TC All is a all in one device which means the tank is built into the box mod making this unit very compact. With an ergonomic design and built-in battery allow for a very slim form factor. The OSUB One 50W features an range of 1W to 50W, and an atomizer resistance range of 0.1 to 3.0 ohms. The OSUB ONE is powered by a built in 2200 mAh battery that is recharged through the Micro USB port. The OLED display is found on the side of the chassis.