The SMOK OSUB One 50W TC All is an all-in-one device which means the tank is built into the box mod making this unit very compact. An ergonomic design and built-in battery allow for a very slim form factor. The OSUB One 50W features a 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.