The Fenix TK22 Flashlight V2.0 flashlight feature a powerful, tough design that is waterproof to the IPX-8 standard, which is great for many extreme outdoor environments. Powered by two CR123A batteries or one 18650 rechargeable battery (Li-ion), this light features multiple brightness levels and is a perfect combination of extremely high intensity and ultra-long runtime. The TK21 is your reliable partner for all of your outdoor adventures Mode: Output / Runtime Turbo: 1600 lumens / 2 hours 10 min High: 500 lumens / 4 hours 40 min Med: 150 lumens / 17 hours Low: 30 lumens / 80 hours