Features:

• LED Emitter: Premium Cree XP-G S2
• 5 Current Regulated Output Levels
• 3 Flash modes: Strobe, SOS, Beacon
• Momentary Activation
• Level Memorization
• Square threads for lifetime smooth operation
• Type III Hard Anodized finish
• Reversible/Removable Clip
• Flexible & secure hand grip accessory
• IPX-8 Waterproofing
• Impact-resistant glass lens with Dual-coating
• T-6061 Aircraft-grade Aluminum Body

Output and Runtime:

• Moonlight: 0.6 lumens (1277 hours)
• Low: 4 lumens (120 hours)
• Medium: 19 lumens (24 hrs)
• High: 83 lumens (5 hrs)
• Max: 177 lumens (42 minutes)
• Strobe: 177 lumens for 2.5 hours
• Beacon: 0-177 lumens pulse for 18 hours

Operation:

Make sure its batteries are inserted with the positive side (+) toward the head. Ensure the bezel (the 'head' of the light) and tailcap are tightened, then depress the tailcap button fully so that it 'clicks' and the light turns on.

The two most commonly used modes are Max and Moonlight, the highest and 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 and the output will switch to the next mode. The mode sequence is determined by whether the bezel is tightened or loosened:

Loosened Bezel: Moonlight -> Low -> Medium -> High -> 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.