Mid sub-ohm model ecig atomizeres have a power range of 15w-30w using a .5 ohm coil. This vapor pipe design is suitable for this range of power. Shown here is the more pricey Eleaf iStick 1-40w 2600mAh "box mod" style regulated battery. It features variable wattage control, OLED display window, temperature control and 10 second auto shutoff. The atomizer is an Authentic Kangertech Subtank Mini with .5 ohm resistance coil and 4.5ml tank capacity. This pipe design is not recommended for the super sub-ohm (40-80+) models.