Rechargeable. 4 1/8" overall. CREE XM-L2 U2 LED. Black CNC Machined Aero grade aluminum construction. Turbo mode with 1,000 lumen output and 2 hour runtime. High - 410 lumen output with 2 hour, 45 minute runtime; Medium - 230 lumen output with 5 hour, 45 minute runtime; low - 50 lumen output with 15 hour, 45 minute runtime; and Low - 1 lumen output with 235 hour runtime. Three Concealed special modes: Location Beacon, SOS, and Strobe. Integrated USB charging port with dust cover. Uses one 18650 Li-ion rechargeable battery or two disposable lithium CR123 batteries (batteries not included). Includes USB cable, black nylon belt holster, black cord wrist lanyard, detachable pocket clip, and spare O-ring. Boxed with hanging tab.