The XP910 can conveniently run on one 18650 rechargeable battery which is included or two CR123A batteries. The dial at the head of the flashlight allows you to alternate between modes with ease. This flashlight has 4 modes to choose from: High, Medium, Ultra Low and Strobe. On high this flashlight has a 3.5 hour run time with an astounding 1000 lumens on high or 43 hours on ultra-low.
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