Measures approximately 3" x 2" x 2". One white Luxeon Rebel LED, plus two red, and two green LEDs. High (255 lumens, 2hr), low (10 lumens, 24hr). Five position lock-out switch. Glass-filled polycarbonate housing with rugged stainless lens ring. Silent Hinge adjustable tilt. Camo headstrap. Uses one CR123A lithium battery (included). Hang packaged.