Nitecore NU25 400L Ultralight Rechargeable Headlamp User Manual

Introduction

This manual provides detailed instructions for the safe and efficient operation of your Nitecore NU25 400L Ultralight Rechargeable Headlamp. Please read this manual thoroughly before use to ensure proper functionality and to maximize the product's lifespan. The NU25 400L is designed for outdoor activities, offering multiple light sources and a lightweight design.

Package Contents

• Nitecore NU25 400L Headlamp
• Built-in 650mAh Li-ion Battery (pre-installed)
• USB-C Charging Cable
• Headband

Product Overview

Image: The Nitecore NU25 400L headlamp, featuring a compact black body with two main LED lenses and a smaller red LED. It is attached to a yellow and black elastic headband, designed for comfortable wear. The headband includes adjustable cords for a secure fit.

The Nitecore NU25 400L is an ultralight rechargeable headlamp equipped with dual beams (spotlight and floodlight) and a red light. It features a unibody optical lens system for uniform light distribution and is powered by a built-in 650mAh Li-ion battery, rechargeable via USB-C. Its compact and durable design makes it suitable for various outdoor activities.

Setup

1. Charging the Battery

1. Locate the USB-C charging port on the headlamp.
2. Connect the provided USB-C cable to the headlamp and a USB power source (e.g., wall adapter, computer, power bank).
3. During charging, the four power indicators will flash to show the charging status. When fully charged, all four indicators will glow steadily.
4. A full charge typically takes approximately 1 hour and 20 minutes.

2. Attaching the Headband

• Thread the elastic headband through the attachment points on the headlamp bracket.
• Adjust the length of the headband using the buckles to achieve a comfortable and secure fit around your head.
• The headband is designed to be dual-purpose, featuring reflective and glow-in-the-dark properties. It can also be detached for cleaning or to be used as a running headband.

Operating Instructions

1. Power Button and Mode Button

The NU25 400L features two distinct buttons for operation: the Power Button (larger, raised) and the Mode Button (smaller, recessed). These buttons are designed for easy one-handed operation.

2. Turning On/Off

• To Turn On: Press and hold the Power Button for approximately 1 second.
• To Turn Off: Press and hold the Power Button for approximately 1 second while the light is on.

3. Brightness Levels and Light Source Selection

The headlamp offers four brightness levels and three light sources (Spotlight, Floodlight, Red Light).

• White Light (Spotlight/Floodlight):
  • When the light is on, short press the Mode Button to cycle through brightness levels: Low (Floodlight) → Medium (Floodlight) → High (Spotlight + Floodlight).
  • To switch between Spotlight and Floodlight modes (when not in High), double-press the Power Button.
• Red Light:
  • When the light is off, press and hold the Mode Button for approximately 1 second to directly access Red Light mode.
  • While in Red Light mode, short press the Mode Button to cycle between Red Light Constant On → Red Light Slow Flash.

4. Special Modes (SOS, Location Beacon)

• When the light is off, double-press the Power Button to activate the SOS mode.
• While in SOS mode, short press the Mode Button to switch to Location Beacon mode.
• To exit special modes, short press the Power Button.

5. Lockout Mode

Lockout Mode prevents accidental activation of the headlamp, conserving battery life and preventing unintended light emission.

• To Activate Lockout Mode: When the light is off, press and hold both the Power Button and the Mode Button simultaneously for approximately 2 seconds until the headlamp flashes once.
• To Deactivate Lockout Mode: While in Lockout Mode, press and hold both buttons simultaneously for approximately 2 seconds until the headlamp flashes once and then turns on.

6. Power Indication

The headlamp features four power indicators to display the remaining battery level:

• 4 Indicators On: Approximately 75% - 100%
• 3 Indicators On: Approximately 50% - 75%
• 2 Indicators On: Approximately 25% - 50%
• 1 Indicator On: Below 25% (Recharge recommended)

Maintenance

• Cleaning: Wipe the headlamp body with a soft, damp cloth. Avoid using abrasive cleaners or solvents.
• Storage: Store the headlamp in a cool, dry place away from direct sunlight. For long-term storage, it is recommended to fully charge the battery every three months to maintain battery health.
• Water Resistance: The NU25 400L is rated IP66, meaning it is protected against dust ingress and powerful water jets. It is not designed for submersion.

Troubleshooting

• Headlamp not turning on:
  • Check if the battery is charged. Connect to a USB-C power source to charge.
  • Ensure the headlamp is not in Lockout Mode. Deactivate Lockout Mode as described in the Operating Instructions.
• Light output is dim:
  • The battery level may be low. Recharge the headlamp.
  • Ensure the lens is clean and free from obstructions.
• Charging issue:
  • Verify the USB-C cable is properly connected to both the headlamp and the power source.
  • Try a different USB-C cable or power adapter.

Specifications

Warranty and Support

Nitecore products are covered by a warranty. For detailed warranty information, please refer to the official Nitecore website or contact your local distributor. If you encounter any issues or require technical assistance, please contact Nitecore customer support through their official channels.