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 S2 emitter. Quark Mini 123 The Quark Mini is the perfect every-day-carry pocket flashlight. It is ultra compact and has a simple, easy to use interface (the same great interface used in the Preon flashlight). Like the regular Quarks, the Mini uses the latest in LED technology, has ample knurling for a sure grip and is at a price point affordable for everyone. Specifications: LED: Cree XP-G S2 Maximum output: 189 Lumens Material: Type III Hard-anodized aircraft-grade aluminum. Lens: Optical-grade glass lens with anti-reflective coating on both sides. Water resistance: IPX-8 Battery: One CR123A (3V max) Included. Seven Output Modes: Low: 3 Lumens - 150 hours Medium: 40 Lumens - 8 hours. High: 189 Lumens - 1.2 Hours. Strobe: 2.4 hours SOS: 7.2 Hours Beacon (HI): 12 Hours. Beacon (LO): 60 Hours Dimensions: Length: 2.3" Diameter: 0.8" Weight: 0.62 oz (w/o battery) Included Accessories: Replacement O-Ring Lanyard Operation: Operating your Quark Mini 123 is simple. Make sure its batteries are inserted with the positive side (+) lowered towards the head. Ensure the tail cap is tightened. To turn the Quark Mini 123 on, tighten the bezel (the "head of the light) fully down. The Quark Mini 123 will turn on when the bezel is fully tightened, and turn off when the bezel is loosened. Selecting regular Outputs: To select a different level of constant output, turn the Quark Mini 123 off and then on again within 1 second. This will select the next level of constant output in the following sequence: Low -> Medium -> High If the Quark Mini 123 is turned off for 2 seconds or longer, it will revert back to Low. Selecting Special Outputs: The Quark Mini 123 has 4 special output modes: Strobe, S.O.S., Beacon (Hi) and Beacon (Lo). To access these modes, quickly switch through two full "cycles" of the regular outputs, starting with Low. These two full cycles must be completed within 3 seconds: Low -> Medium -> High -> Low -> Medium -> High -> Special Outputs You can continue to cycle through the special outputs in the following sequence: Strobe -> S.O.S. -> Beacon (Hi) -> Beacon (Lo) After Beacon (Lo) mode, the output reverts back to Regular Low. Both Beacon modes will first flash 5 times and then once every 10 seconds. In the box: Quark Mini 123 O-Ring Lanyard