3 "AAA", Indestructible Hi Performance LED Headlight, 180 Lumens, 2 Light Modes: High & Energy Saver, 100 Meter Beam Distance, 30', Drop Tested, Aluminum Titanium Body, Water Resistant To IPX4, Over Mold Rubber Pivoting Head, Shatterproof Lens & Reflector, Impact Resisting Internal Engineering, 3 Hour Run Time, Includes Head Strap & Moisture Wicking Cloth, Uses 3 "AAA" Alkaline Batteries, Included.