The Aspire 220W Dynamo kit is a dynamically versatile and powerful device. It is not only compatible with dual 21700/20700 batteries it comes with a silicone sleeve to make it also compatible with 18650 batteries. The Dynamo can be used in a variety of modes such as Wattage, Voltage, Bypass, CPS, TC, and TCR. One of its feature is the circular LED screen, which has the Watch UI. The Watch UI allows the user the customize the watch that is built in with the software. The kit comes with the Nepho Tank. The Nepho Tank, comes with two coils the 0.5ohm coil made with Kanthal wire and a 0.15ohm coil made with our all new mesh coil.