It allows for use with three different battery types, 18650, 20700 or 21700. The Dynamo can also be used in various modes, allowing you to easily select between Wattage, Voltage, Bypass, CPS (C1/C2/C3), TC(Ni/Ti/SS316L) and TCR(M1/M2/M3). It comes in five super colours Dark Grey, Red with Black, Rainbow, Purple, and Camo with Black. Even though the Dynamo is a dual battery mod, it is still quite ergonomic and comfortable to hold thanks to its rounded sides and corners. With an output wattage of up to 220 watts regardless of which type of battery is used, 18650, 20700 or 21700