The NITECORE HC35 L-shaped headlamp is the first next generation headlamp to feature a high performance 21700 battery. This powerful battery unleashes the quad LEDs max brightness of 2700 lumens turbo with over 146 yards of beam throw. The quick detach headlamp bracket allows you to easily rotate the flashlight on the headband to illuminate where you need it. Key Features: CONVENIENT BATTERY OPTIONS The NITECORE HC35 comes with a high performance, 4000mAh 21700 li-ion battery that provides up to 1200 hours of uninterrupted operation. It can also run on any >8 high discharge 18650 battery, a pair of CR123, or RCR123 batteries when you use included battery adapter sleeve. With a built-in micro USB charging port, and LED power indicator, the HC35 will not leave you in the dark when paired with a rechargeable battery. VERSATILE L-SHAPE DESIGN When removed from the bracket the multipurpose, 90 degree design allows the headlamp to double as a handheld flashlight or worklight. Enjoy hands-free illumination with the magnetic tailcap, while the removable pocket clip provides simple carry options. Specifications Max Output 2700 Lumens Max Beam Distance 134 m Max Beam Intensity 4500 Max Runtime 1200 h 0 m / 50 d LED 4 x CREE XP-G3 S3 LED Reflector SMO Battery 1 × 18650 ,2 × CR123 ,2 × RCR123,1 × 21700 Special Modes Location Beacon,SOS,Strobe Beam color White light Length 128.2 mm / 5.04 in Weight 138.5 g / 4.88 oz Activity Gear,Outdoor/Camping Please note batteries not included*