4.75" overall. Water resistant. Impact resistant. Rechargeable. Clip. Lanyard. TIR optic lens. MCC3 magnetic charging cable. High performance cool white LED. Front switch. Modes: Turbo (2500 lumens, 2m runtime); High (500 lumens, 4.5h runtime); Medium (120 lumens, 18h runtime); Low (30 lumens, 66h runtime); Moon (5 lumens, 12.5 day runtime). Built-in proximity sensor to drop brightness in case of obstruction. Nylon headband with silicone bracket. Requires (1) 21700 battery (included). Boxed.May not ship Post Office. May not ship to Australia.