Aegis Legend mod is powered by dual high-amp 18650 batteries (sold separately). Aegis Legend mod increases maximum power output to 200W with the intelligent AS Chip. Equipped with a 0.91" full-color OLED display screen for organized informational readout, USB port is designed for charging and firmware update. It supports Power Wattage, VPC(Power Curve Adjustments), TC, TCR(Temperature Coefficient of Resistance Adjustments), and BYPASS Mode.