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.Innovation keeps changing the vaping experience!