Ruggedly constructed and beautifully finished, the X-Series started the LED flashlight revolution. Today, the X-Series is still recognised as being the ultimate collection of flashlights in the field, and has earned the praise of countless users who have come to depend on them, as well as curators at one of the world's most famous museums of modern art where a sample has been placed on permanent display. Long hours of usable light, powerful beams, unmatched quality and superior styling all make the X-Series the choice for those who want a flashlight that provides uncompromising performance. Dimensions: (length by diameter) 5.84" x .861" 1.1" head dia. Weight: 5.43 oz Lumens: 85 Runtime: Up to 3 Hours Effective Range: Up to 147 ft Signal Visibilty: Up to 2 miles Battery Type: 2 - AA alkaline