Only 3 1/4" overall. Aircraft grade aluminum body with anodized finish and lanyard hole. Twist the head to turn on, turn off, and focus spot to flood. Water resistant up to 1m. State-of-the art, Ultra Bright white LED with up to 37 lumen output. Visible up to 55m. Requires one AAA battery (included). Up to 1 hour, 45 minute run time per battery. Hardshell gift box. Keyloop. Weight with batteries 0.8 oz.