5.1" overall. Tailcap switch. Water resistant. Impact resistant. SOS strobe. Strobe. Lanyard. Clip. Modes: (18650) Turbo (1200 lumens, 3m runtime), High (600 lumens, 2h 20m runtime), Medium (250 lumens, 6h 15m runtime), Low (60 lumens, 20h runtime), Moon (1 lumen, 50 days runtime); (2-Cr123A) Turbo (900 lumens, 3m runtime), High (400 lumens, 3h runtime), Medium (60 lumens, 14h runtime), Low (15 lumens, 42h runtime), Moon (1 lumen, 30 days runtime). Three-in-one tail switch operation: momentary-on turbo (soft press); on/off (medium press); momentary-strobe (deep press). Exposed thumbnail sized tail switch for firm and easy operation. Quiet tail switch with minimal noise for maximum concealability. Faster strobe frequency: 13 cycles per second. Comfortable ergonomic knurling on the flashlight body and tail cap. Requires (1) 18650 battery (not included), or (2) CR123A batteries (not included). Aluminum construction. Color: Black. Boxed with hanging tab.