4.9 in. black 6000 series machined aircraft aluminum with anodized finish. Luxeon 1 watt super high flux 10000 hour LED bulb 22 lumens for 4 hours of high brightness or 50 hours of declining brightness run time. Takes 2-3V lithium batteries. 3.95 ounces. Tail cap switch for constant on/off.ATTRIBUTES Bulb: LED Burn Time: 1.75 Hours Carry System: Lanyard & Clip Finish: Black Anodized Material: Aluminum Output (lumens): 22 Overall Length (inches): 4.90 Power Source: CR123A Lithium x 2 Submersible: No Switch: Tailcap Push Button