Breakthrough lumen output armored in a machined aluminum housing. the Backcountry DUO is the brightest. most durable headlamp ever designed for the hunter. Engineered to endure any mountain adventure. the Backcountry DUO is powered by a re-chargeable 3.7v. 3600 mAh battery boasting run times up to 69 hours so you can trust you’ll never be left in the dark. The XLamp XM-L2 LED is the highest-performing. commercially-available. single-die LED on the market and the ultra/high/low settings work in both Red and White light for the stealthy hike in or the treacherous grind out. The adjustable head strap provides ample comfort for extended wear beneath the stars while the headlamp housing allows full 180 degree maneuverability for convenient and versatile use. In every way. the PEAX Backcountry DUO headlamp is designed to help you thrive on the mountain. PRODUCT REVIEW ?Steven Drake breaks down all the features and benefits of the Backcountry DUO. PRODUCT SPECIFICATIONS Weight: 2.65 oz (79 g) excludes battery Size: 3.5 in (89mm) x 1 in (25mm) Max Output: 1.000 lumen (Range: 490 ft) Light Modes: White Red Run Modes: Ultra / High / Low / Strobe / Fade / Lock/Unlock Run Times (White): Ultra (6-8 hrs) / High (16-18 hrs) / Low (55-59 hrs) Run Times (Red): Ultra (10-13 hrs) / High (20-23 hrs) / Low (65-69 hrs) Water Resistance Rating: IPX6 Battery: Rechargeable 18650 3.7v. 3600 mAhIn every way. the PEAX Backcountry DUO headlamp is designed to help you thrive on the mountain.PRODUCT REVIEW.?Steven Drake breaks down all the features and benefits of the Backcountry DUO.PRODUCT SPECIFICATIONS Weight: 2.65 oz (79 g) excludes battery Size: 3.5 in (89mm) x 1 in (25mm) Max Output: 1.000 lumen (Range: 490 ft).