5 3/4 overall. Indestructible Mil-Spec grade 1 aluminum body. CREE XM-L2 U2 LED with up to 1040 lumen output. Seven modes: Momentary On (1040 lumens); Turbo (1040 lumens); High (530 lumens); Medium (250 lumens); Low (80 lumens); Strobe (9Hz); SOS (530 lumens). Uses two CR123A batteries or one ultra-high capacity 18650 li-ion battery. Includes charging port for direct recharging. Duo Switch with click and tap function for easy mode switching. Impact resistant and water proof. Hang packaged.Lithium Metal contained inside item.