RPM 4 emerges from appeals that vapors desire a sophisticated, portable and stylish vaping device in the current time. The 1650mAh built-in battery with wattage up to 60W maintains sufficient power and strong performance to each puff with great content. With the combination of the ste pless airflow adjustment and 2 replaceable meshed coils, RPM 4 is decent to change tastes between DL and RDL while you drag the slider to left or right. Go find unlimited taste pleasure in the limited airway.