The Fenix TK16 V2.0 has a brand new look and is loaded with great features. This excellent flashlight produces a total of 3100 lumens, all powered by a single 21700 battery. The 21700 battery is included with your purchase, it is USB Type-C rechargeable, and will need to be removed for charging. A new feature of the TK16 V2.0 tactical flashlight is the advanced pulse-frequency transmission system for better anti-interference performance. Some of the most remarkable features of the Fenix TK16 V2.0 were kept on this update, like the dual tail switch and instant strobe for real tactical performance. We recommend the TK16 V2.0 to anyone who needs a compact tactical flashlight that provides an impressive amount of light power.