The VPARK Maxtank Mini is a compact tank with a large capacity. He works best between 20 and 50W just a coil of 0.3 - 0.5 Ohms. Both coils are supplied with the tank (0.5 Ohm is already installed in the tank itself). The easy of this tank is that he has to fill over the top. So, you can without too much hassle refill your liquid. In addition, he has an airflow control to this tank all the way you put your hand.