5 1/2" overall. 2 1/4" head diameter. Black aircraft aluminum alloy housing. Integrated multi-function LED display. Display features lumen output/brightness mode, battery status, battery voltage, approximate runtime and temperature. Four white CREE XM-L2 U3 LEDs. Five modes including strobe. Turbo Mode on (4) 18650 - Lumens: up to 4,000 lumen, runtime: up to 45m. Turbo Mode on (8) CR123 - Lumens: up to 4,000, runtime: up to 1h. High Mode on (4) 18650 - Lumens: up to 1,900, runtime: up to 2h 30m. High Mode on (8) CR123 - Lumens: up to 1,900, runtime: up to 2h 15m. Mid Mode on (4) 18650 - Lumens: up to 700, runtime: up to 8h 15m. Mid Mode on (8) CR123 - Lumens: up to 700, runtime: 5h 45m. Low Mode on (4) 18650 - Lumens: up to 230, runtime: up to 48h. Low Mode on (8) CR123 - Lumens: up to 230, runtime: up to 32h. Lower Mode on (4) 18650 - Lumens: up to 3, runtime: up to 1,000h. Lower Mode on (8) CR123 - Lumens: up to 3, runtime: up to 750h. Beam distance: up to 454m. Peak Beam Intensity: 51,600cd. Impact Resistant: up to 1m. Waterproof: up to IPX-8 (2m). Integrated "Precision Digital Optics Technology" provides extreme reflector performance for throwing distance of up to 454m while four stainless steel bezel rings protect the PDOT reflectors from damage. Patented multi-functional single switch allows for easy one-handed control of all functions. Intelligent charging circuitry charges 18650 Ii-ion batteries safely and rapidly. When charging is complete, a built-in microprocessor terminates charging automatically and displays charge status on OLED screen and via the blue indicator light. All circuitry contact points are gold plated. Four stainless bezel retention rings protect core components from damage. Dual-side-coated mineral glass ensures maximum optical efficiency and light transmittance. Strengthened thermal heat fins combined with a temperature sensor make this light extremely stable and reliable. Flat tail cap offers convenient "tail stand" ability to use as an upward-facing spotlight. Intregrated camera-style tripod mounting point. Compact, lightweight and portable. Black nylon belt sheath. Uses either four 18650 Li-ion rechargeable or eight CR123 batteries. (Batteries not included). Includes battery charger and lanyard.