The Fenix E18R is truly an impressive flashlight. You get a maximum 750 lumens from a 2.36-inch flashlight, weighing only 1.17 ounces (without the battery) AND it is rechargeable via an included magnetic charging cable. You can always trust the construction of a Fenix flashlight. The oxidation-resistant aluminum body and the ultra-thin optical lens are built to withstand every-day use as well as the harshest elements. The E18R operates with two battery sources: the recommended rechargeable 16340 battery or a CR123A battery as a backup source or a source when in below-freezing temperatures. You will want to add the E18R to your EDC lineup. The size and output make the E18R perfect for hiking, camping, fishing, and industrial use. SPECIFICATIONS: --Cree XP-L HI LED with a lifespan of 50,000 hours --Lumen output based on one 16340 rechargeable battery --Turbo: 750 lumens/45 min. (446 ft./136 meters) --High: 150 lumens/2 hr. 35 min. (190 feet/58 meters) --Med: 30 lumens/13 hr. 50 min. (82 feet/25 meters) --Low: 5 lumens/70 hr. (46 feet/14 meters) --Magnetic charging in the neck - Magnetic charging cable included --Lockout function and multiple ways to avoid accidental activation --Battery-level indicator --Automobile-type optical lens coating process --Side switch for one-switch operation --Magnetic tail --Reverse polarity protection to protect from improper battery insertion --Intelligent overheat protection --Low-voltage warning to remind when battery needs to be recharged --Digitally-regulated output maintains constant brightness --Durable high-strength, oxidation-resistant aluminum --Operates on a rechargeable 16340 battery or non-rechargeable CR123A battery --IP68 -Rated: totally protected against dust and foreign objects and submersible to 6.5 feet for 30 minutes SIZE: --Length: 3.7 Inches --Diameter: 0.8 Inch --Weight: 1.65 Ounces PRC