Fenix TA20 utilizes the Fenix patent technology–mechanical revolving dimmer system to precisely lock onto its 4 output modes- 3 different levels of output and strobe. With a maximum output that reaches 225 lumens, and delivers 170 hours continuous minimum runtime, the TA20, powered by two 3V CR123A lithium batteries, features a structure providing better grip , the TA 20 flashlight is your reliable companion for your daily duties and outdoor adventures.(To select a level of output, the operator twists the selector-ring on the head of the flashlight.)