The Fenix TK35 LED flashlight is powered by four 3V CR123A batteries or two 18650 rechargeable batteries. With four light levels and two flashing modes (strobe and SOS) you can have the level and type of light. The TK35 has a regular power switch tail cap and a secondary mode tail cap for quick and easy brightness level adjustment.
Like other Fenix flashlights the TK35 has a durable aircraft-grade aluminum body with a Type III hard coat anodized finish, ultra-clear glass lens with an anti-reflective coating, reverse polarity protection so you don't fry the circuit, and digitally regulated output for constant brightness. ANSI/NEMA FL1 standards.