The Innokin Endura M18 is powered by a 700mAh built-in battery and contains a 2ml unit cartridge. It is lightweight, thin and straightforward to operate. Click 3 times to operate boost mode which is 13.5W giving you more heat and flavour. (Regular: 10W and Boost: 13.5W) It is draw activated so no need to press a button when you are vaping. You can also very easily change coils by simply twisting the base.