Introduction
Thank you for choosing the Sofirn HS42 Rechargeable Headlamp. This manual provides essential information for the safe and effective use of your new headlamp. Please read it thoroughly before operation and retain it for future reference.

Image: The Sofirn HS42 headlamp attached to its adjustable black headband, ready for use. The headlamp itself is black with a textured body for grip, featuring a clear lens over the main LED and smaller auxiliary LEDs.
Package Contents
Upon opening the package, please verify that all components are present and in good condition:
- Sofirn HS42 Headlamp Unit
- Adjustable Headband
- USB Type-C Charging Cable
- Pocket Clip
- Spare O-rings (2)
- User Manual
Video: An unboxing and detailed display of the SOFIRN HS42 product, showing all included components and their initial presentation.
Setup
1. Battery Preparation
The Sofirn HS42 headlamp uses a rechargeable 18650 Lithium-Ion battery. Before first use, ensure the battery's insulating paper disc is removed. Unscrew the tail cap, remove the disc, and re-tighten the tail cap securely.
2. Charging the Headlamp
The headlamp features a convenient Type-C charging port. Connect the provided USB Type-C cable to the headlamp and a compatible USB power source (e.g., wall adapter, power bank, computer USB port).
- The indicator light will show red during charging.
- The indicator light will turn green when charging is complete.

Image: Close-up of the headlamp showing the USB Type-C charging port and the indicator light, illustrating its red (charging) and green (fully charged) states.
3. Attaching the Headband and Clip
The HS42 can be used as a headlamp or a handheld flashlight with a pocket clip. To use as a headlamp, slide the unit into the silicone mount on the adjustable headband. To use as a handheld flashlight, attach the included two-way pocket clip to the body of the headlamp. The magnetic tailcap allows for attachment to metal surfaces for hands-free work.

Image: A collage demonstrating the versatile uses of the headlamp: worn as a headlamp, held as a right-angle flashlight, clipped to clothing, and attached to a metal surface via its magnetic base for use as a work light.
Operating Instructions
The Sofirn HS42 features a single button for all operations. Familiarize yourself with the following commands:
General Operation:
- Turn On/Off: Single click the button to turn the light on or off.
- Change Brightness (White Light): When the light is on, press and hold the button to cycle through Moon, Low, Medium, and High modes. Release the button to select the desired brightness.
- Turbo Mode: From any mode (except lock-out), double-click the button to activate Turbo mode. Double-click again to return to the previous mode.
- Strobe/SOS/Beacon: From any mode (except lock-out), triple-click the button to activate Strobe mode. Double-click to cycle through Strobe, SOS, and Beacon modes. Single click to turn off.
- Red Light Mode: From off, triple-click the button to activate Red Light mode. Press and hold to cycle through red light brightness levels.
- Lock-out Function: From off, quadruple-click the button to activate lock-out. The light will flash once to indicate it's locked. To unlock, quadruple-click again.

Image: Visual representation of the various white light modes (Moon, Eco, Low, Medium, High, Turbo, Strobe, SOS, Beacon) and red light modes (Low, Medium, High, Strobe, SOS) available on the Sofirn HS42 headlamp.
Intelligent Temperature Control:
The HS42 is equipped with an intelligent temperature control system. When operating in extremely bright or high brightness modes, the headlamp will automatically reduce the output current if the internal temperature exceeds 55 degrees Celsius. This feature maintains an appropriate shell temperature, preventing overheating and ensuring a longer lifespan for the device and a safer user experience.
Maintenance
Proper maintenance ensures the longevity and optimal performance of your Sofirn HS42 headlamp.
- Cleaning: Wipe the headlamp with a clean, soft cloth. For stubborn dirt, use a slightly damp cloth. Do not use abrasive cleaners or solvents.
- Battery Care: For best results, charge the battery regularly, even if the headlamp is not in frequent use. If storing for extended periods, charge the battery to approximately 50% and recharge every 3-6 months.
- O-rings: Periodically inspect the O-rings for wear and tear. Replace them if damaged to maintain the IP66 waterproof rating. A light application of silicone grease can help maintain their integrity.
- Water Resistance: The headlamp is IP66 waterproof, meaning it is protected against powerful water jets. While it can withstand rain and splashes, it is not designed for prolonged submersion. Ensure the Type-C port cover is securely closed when not charging to maintain water resistance.

Image: The Sofirn HS42 headlamp shown in a rainy environment, highlighting its IP66 waterproof rating and 1-meter impact resistance, indicating its durability in harsh conditions.
Troubleshooting
If you encounter issues with your Sofirn HS42 headlamp, please refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Light does not turn on. |
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| Light flickers or dims unexpectedly. |
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| Headlamp does not charge. |
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If the problem persists after attempting these solutions, please contact Sofirn customer support for further assistance.
Specifications
| Model | HS42 |
| Light Source | LED |
| Brightness | Up to 2100 Lumens (White Light) |
| Beam Distance | Up to 215 Meters (465 Feet) |
| Power Source | Rechargeable Lithium Polymer Battery (18650 type) |
| Charging Port | USB Type-C |
| Runtime | Up to 32 hours (depending on mode) |
| Material | Aluminum Alloy |
| Water Resistance | IP66 (Protected against powerful water jets) |
| Impact Resistance | 1 Meter |
| Dimensions | 3.15"D x 1.22"W x 1.22"H |
| Weight | 10.5 ounces |
| Special Features | Red Light Mode, Intelligent Temperature Control, Magnetic Tailcap, 2-Way Clip |

Image: A visual comparison demonstrating the powerful 2100 lumen white light output and the 215-meter beam distance of the Sofirn HS42 headlamp in a dark outdoor setting.
Warranty
The Sofirn HS42 Rechargeable Headlamp comes with a 2-year warranty from the date of purchase. This warranty covers manufacturing defects and issues arising from normal use. It does not cover damage caused by misuse, unauthorized modification, accident, or neglect.
Please retain your proof of purchase for warranty claims.
Support
For any questions, technical assistance, or warranty inquiries, please contact Sofirn customer support through the following channels:
- Online Store: Visit the official Sofirn Store on Amazon.
- Email: Refer to the contact information provided in your product packaging or on the official Sofirn website.
Our support team is dedicated to providing prompt and helpful solutions.





