Nitecore NU21 Ultra-Light Dual Beam Headlamp - 360lm - 1.55oz - USB-C

The Nitecore NU21 is an ultra-light dual beam headlamp delivering 360lm maximum output and a 190ft / 58m beam distance, designed specifically for running, trail, and outdoor activities. Weighing only 1.55oz / 44g (headband and bracket included), it features a unibody multi-facet optical lens system for a soft, uniform light. Lightweight, versatile, and built for night-time outdoor use, the NU21 combines performance and endurance to keep up with every adventure.

Dual Beam and Lighting Versatility

The NU21 offers 4 white light levels (High 360lm / Mid 170lm / Low 60lm / Ultralow 6lm) plus 2 special modes, SOS and Beacon, for emergency situations. Its integrated red light (constant 5lm or slow flash 10lm) preserves night vision, ideal for map reading, navigating in fog, and signaling. The dual-button interface, with buttons differentiated by shape and feel, enables intuitive one-handed operation even with gloves. The built-in 500mAh Li-ion battery recharges via USB-C with a maximum runtime of 37 hours in Ultralow mode. 4 power indicators display the remaining battery level at a glance.

Extreme Lightweight and USB-C Charging

At just 1.55oz / 44g, the NU21 is built to be forgotten on your head. Its hollow ultra-light bracket and reflective glow-in-the-dark headband eliminate any sense of weight, even on long trail runs or night jogs. The unibody multi-facet optical lens system produces soft, uniform light perfectly suited for trail running. The lockout mode prevents accidental activation in a pocket or bag, while the reflective headband increases your visibility to drivers.

Operating Instructions

Two buttons: POWER button (on/off, white light levels) and MODE button (light source, red light, special modes).

Power On/Off: Hold POWER for 1 second to turn on (LOW level) or off. Hold MODE for 1 second to turn off when the light is on.

White Light Levels: Brief press on POWER to cycle LOW - MID - HIGH. Double press POWER from off state to access ULTRALOW.

Red Light: Hold MODE for 1 second from off state. Brief press POWER to toggle constant / slow flash.

Light Source Switch: Brief press MODE when the light is on to toggle white / red light.

Special Modes SOS / Beacon: Double press MODE from any state. Brief press POWER to alternate between SOS and Beacon. Double press MODE again to return to previous state.

Lock / Unlock: With light off, hold both buttons for 2 seconds until the headlamp flashes 3 times (locked). Same action to unlock (ULTRALOW turns on). The NU21 unlocks automatically when charging.

Battery Indicator: Brief press MODE with light off; the 4 indicators light up in sequence then turn off after 2 seconds.

Charging: Connect the included USB-C cable. The indicators display charging progress.

Specifications

• LED: White LED + Red LED
• HIGH: 360lm (2h) 190ft / 58m 840cd
• MID: 170lm (3h30)
• LOW: 60lm (8h)
• ULTRALOW: 6lm (37h)
• SOS: 360lm
• BEACON: 360lm
• Red light constant: 5lm (26h)
• Red light slow flash: 10lm
• Power source: Built-in 500mAh Li-ion battery
• Maximum runtime: 37h (ULTRALOW mode)
• Charging port: USB-C
• 4 battery level indicators
• Material: PC (polycarbonate)
• Waterproof rating: IP66
• Impact resistance: 3.28ft / 1m
• Dimensions: 2.37" / 60.1mm (L) x 1.30" / 33mm (W) x 1.00" / 25.5mm (H) (bracket included)
• Weight: 1.55oz / 44g (headband and bracket included)

Box Contents

• 1 Nitecore NU21 Headlamp
• 1 Reflective glow-in-the-dark headband
• 1 USB-C charging cable
• 1 User manual