Princeton Tec Sector 5 Flashlight (550 Lumens) Packs A Powerful 550 Lumen Beam With The Convenience Of A Pistol Grip Momentary Or Constant Illumination Momentary On Via A Half-Pull And Constant On Via Full Pull Four C-Cell Batteries Minimize Bulk While Providing 24 Hours Of Burn Time New Trigger Switch Design Is Easy To Use With Gloved Hands