Features:

4 x CREE XP-G3 S3 LEDs for a maximum output of 2700 lumens
Peak Beam Distance: 134m
Peak Beam Intensity: 4,500cd
90-degree L-shape design easily removable flashlight body to double as a work light
Included 21700 high-performance rechargeable battery
Built-in micro USB charging port
Magnetic tail cap can snap to metal surfaces
Built-in LED battery power indicator
Lightweight and rigid CNC machined body for an excellent cooling performance
Utilizes a bead surface total reflective optic lens for uniform and soft light
One switch controls 5 brightness levels and 3 special modes
Battery Type Supported:

1 x 21700 or 1 x 18650 (>8A output) OR
2x CR123 Batteries

Brightness Outputs:

Turbo: 2700 lumens / 45 min
High: 800 lumens / 3 hrs
Medium: 270 lumens / 8h 15 min
Low: 40 lumens / 52h
Ultralow: 1 lumen / 1200h

Strobe: 2700 lumens
SOS: 2700 lumens
Beacon: 2700 lumens
*The runtime for TURBO mode is tested without temperature regulation
*TURBO mode is only accessible using 21700 or 18650 (>8A output)
STROBE Mode uses randomly changing frequencies for stronger dizzying effects
The power indicator beneath the switch indicates the remaining battery power (Patent No. ZL201220057767.4)
The power indicator can also display the battery voltage (±0.1V)
Wide range flood optic system of 100° illumination angle specially designed for outdoor applications Incorporated Advanced Temperature Regulation (ATR) module (Patent No. ZL201510534543.6)
Specially designed lightweight and breathable headband included
Electronic reverse polarity protection
Constructed from aero grade aluminum alloy
HA II military grade hard-anodized finish
Rating in accordance with IP68 (2 meters submersible)
Impact-resistant to 1 meter
Dimensions: Length 128.2mm, Head Diameter 28.85mm, Tube Diameter 26mm
Weight: 138.5g (without battery)

Package Includes:

1 x Nitecore HC35 Headlamp
1 x Nitecore NL2140HP 21700 4000mAh Rechargeable Li-ion Battery
1 x 18650/CR123 Battery Magazine Adapter
1 x Micro-USB Charging Cable
1 x Headband
1 x Bracket
1 x Spare O-ring
1 x Pocket Clip
1 x Lanyard
1 x User Manual
1 x Warranty Card

Warranty Terms:
5 Year Warranty on the light (ONE YEAR WARRANTY IF there is a rechargeable battery included which will be mentioned in the "package includes" section) from date of purchase against manufacturing defect. Accessories (such as pocket clip, lanyards, holsters, etc), normal wear and tear, drop & water damages are not covered, nor is damage resulting from abuse, neglect, battery leakage or altering this product from its original state.

See in the official website: https://flashlight.nitecore.com/product/hc35