Drag 4 is powered by dual external 18650 batteries with 177W max (batteries not included). With the ECO Mode and 5V/3A Type-C fast charging, it features less charging time and more vaping enjoyment. By utilizing the new TC Mode, it can match the 4 heating materials like Ni200, Ti, SS316, SS430 more effectively and meets the specific need for DIY users. The multi-function switch makes it easy to define QS lock's function like lock wattage, lock device, and power off. The new UI design allows you to define your style with 4 optional colors. In addition, it also features replaceable and durable magnetic battery cover.