Powered by 3-123a lithium batteries, the T3 has a patented optical system that provides thermal management while harnessing and projecting a powerfully bright (313 lumens) uniform focused spot with flood beam. Features:- impact-resistant head protects optical system- mineral glass optical window has a double-sided anti-reflective coating and a Teflon seal to withstand environmental pressures- high powered energy efficient 35,000 hour LED- electronically controlled for uniform light output- patented optical system - machined aluminum reflector for optimal thermal management and beam projection- uniform focused spot with flood beam pattern- aerospace-grade aluminum body from solid bar stock with military-spec, type iii hard coat anodized finish- aggressive knurling for positive grip- shockproof, crushproof and water-resistant construction- O-ring compression sealing throughout- tactical end-cap switch activates Constant and Momentary high, low, strobe, and lockout modes- high quality wrist lanyard included specifications:- LED color: white- lumens: low: 25 high: 313- run time: low 50 hours 30 minutes high: 5 hours- effective range: up to 617'- battery type: 3-123a lithium (included)- Dimensions: 6.20" x 1"- weight: 6.88 oz. - color: black.