High, low and strobe modes. C4 L.E.D. illumination output and run times: HIGH - 120 lumens/1.75 Hour LOW - 14 lumens/21 Hours STROBE - 4 Hours. Includes 2 AA alkaline batteries. Solid State power regulation provides maximum light output throughout battery life. Rubber push button tail cap switch. IPX7 rated design; waterproof to 1 meter for 30 minutes. Impact-resistant tempered glass lens. Unbreakable pocket clip. Anti-roll head. Includes nylon holster.