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The Quark series of LED flashlights, designed by 4Sevens, is the result of input from engineers and flashlight enthusiasts around the world for over 5 years. The result: there is no finer, more useful flashlight than a 4Sevens. Proven reliability, functional versatility, and enough illumination to challenge the sun itself! This is the flashlight, redefined. All Quarks use the latest CREE XP-G R5 emitter. Quark AA-2 Specifications: LED: Cree XP-G R5 5 Current regulated output Levels. 3 Flash modes: Strobe, SOS, Beacon Square threads for lifetime smooth operation. Maximum output: 205 Lumens Material: T6061 aircraft-grade aluminum. Type III Hard anodized finish. Fully knurled. Reversible/removable clip. Lens: Impact-resistant glass lens with dual-coating - sapphire coating on the outside and anti-reflective on the inside for optimal efficiency and durability. Water resistance: IPX-8 Stands on tail (candle mode) Battery:Two AA (voltage range: 0.9V~4.2V) Included. Seven Output Modes: Moonlight: 0.2 Lumens - 720 Low: 4.0 Lumens - 120 hours Medium: 22 Lumens - 24 hours. High: 65 Lumens - 5 hours. Max: 205 Lumens - 1.3 hours Strobe: 205 Lumens - 2.5 hours Beacon :0 - 205 Lumens - 18 Hours. Dimensions: Length: 5.8" Diameter: 0.86" Weight: 2.2 oz (w/o battery) Included Accessories: Replacement O-Ring Lanyard 2 AA Batteries Holster Rubber Grip Operation: Operating your Quark AA-2 is simple. Make sure its batteries are inserted with the positive side (+) lowered towards the head. Ensure the tail cap is tightened then depress the tail cap fully so that it "clicks" and the light turns on. The two most commonly used modes are Max and Moonlight, the highest and the lowest modes. To access Max, you simply tighten the bezel. To access Moonlight, you just loosen the bezel a half-turn. You can also cycle through the Quark's other modes just as easily. Lightly depress the button momentarily (you don't need to "click" it) and the output will switch to the next mode. The mode sequence is determined by whether the bezel id tightened or loosened. Loosened bezel: Moonlight -> Low -> Medium -> SOS -> Beacon Tightened Bezel: Max -> Strobe Once the Quark has been turned off for at least three seconds, it will revert to the first level of output in the sequence, either Moonlight or Max. In the box: Quark Mini AA-2 O-Ring Lanyard Rubber Grip Holster