Olight S20 Baton, 550 lm, Cree XLamp XM-L2 LED LED: CREE XM-L2, Double click the on/off button to activate strobe mode Runs on: 2x CR123A or 1x 18650 rechareable battery (two CR123A batteries included) Output mode/Runtime: High:550Lumen/2hrs, Mid:120Lm/9hrs, Low:5Lm/120hrs, Moonlight: .5Lm/600hrs Dimensions: Length: 4.17" (70.5mm) Diameter: .9" (23mm) Weight: 1.83 .oz (52g) (excluding battery) Magnetic tail allows the flashlight to be attached vertically on any magnetic surface