4 3/4″ overall. Three selectable modes: high power, 25% power and emergency safety strobe. Up to 139 lumen output. Visible over 145m on high setting. Silver anodized aluminum construction. Push button tail cap switch. Uses three AAA batteries (included). Battery life: 6 hours, 30 minutes on high, 33 hours on low. Water resistant. Black hardshell gift box.