The Ego One Changes it's WATTAGE automatically based on the type of coil head you use. With a 1 Ohm coil head, it puts out about 14 watts, with a .5 Ohm coil head, it puts out 24 watts. The 1 Ohm coil head is for mouth to lung vapers, the .5 Ohm coil is for lung hitters. At .5 it will burn through a 2.5 ml tank pretty fast. I have a 2200Mah version, it is small, stealthy, and puts out a decent amount of vapor. Joyetech will be marketing a rba head for the tank in the very near future, UncleRJ confirmed it with Joyetech.