Revtronic 650 Lumens Compact Tactical Flashlight, Cree LED Ultra Powerful Flashlights for Outdoor, Law Enforcement, Emergency, Hardware Tools and Personal Use, Powered by 18650 Rechargeable Battery Compact and lightweight for outdoor law enforcement security emergency medical service hardware tool and personal use Check if the battery is inserted correctly and touching the contacts The plus sign should be towards the flashlight head Inserting the battery in a wrong way may cause damaged Charge the battery when the Red light indicator ON it means charging when the Green light on it means fully charged Tighten the battery tube and tail cap and make sure the contact is correct Work the switch several times Cree XM-L2 LED with a lifespan of 50,000 hours, max output 650 lumens Uses one 3.7V 18650 rechargeable Li-ion battery or two 3.0V CR123A Lithium batteries 5.1 in.(Length)x0.9 in.(Diameter)x0.92 in.(Head) 2.4 ounces weight(Excluding battery) Digitally regulated output - maintains constant brightness Low-voltage warning function to remind you to replace the battery Anti-roll, slip-resistant body design, removable pocket clip Tactical tail switch with momoentary-on function Made of durable aircraft-grade aluminum IPX-7 waterproof standard