40 watt capability that fits in the palm of your hand with an amazing ergonomic feel. With a wattage range of 6.0W - 40.0W, that can be adjusted in 0.5W increments, and a voltage range from 3.0V - 7.5V, adjusting in 0.1V increments. A 2000mAh battery powers this device, providing a sufficient amount of power for anyone on the go who wants a small unit. The Innokin Cool Fire IV is able to fire atomizers all the way down to 0.3Ω allowing you to fire most of your favorite sub ohm devices. A spring loaded 510 will ensure all of your 22mm atomizers sit nice and pretty.