1. Product Overview
The Silva Trail Runner 4 Ultra is a high-performance headlamp designed for trail running and outdoor activities, offering extended battery life and versatile power options. Its lightweight design and comfortable fit make it an ideal companion for long adventures.

Image: The Silva Trail Runner 4 Ultra headlamp, featuring a white lamp unit with two LED lights and a black adjustable headband. The headband has the "SILVA" logo printed on it.
Key features include:
- Max Distance: 75 meters for clear visibility.
- Burn Time: Up to 90 hours on the lowest setting (50 lm), 40 hours at 150 lm, and 25 hours at 350 lm.
- Power Source: Flexible power options with 1 x Li-Po 2.4Ah rechargeable battery or 3xAAA batteries.
- Lumens: Maximum output of 350 lumens.
- Recharge Time: Approximately 4 hours for the rechargeable battery.
- Included Components: Headlamp, headband, battery, battery pack, extension cable, USB charge cable, cable guide side, red safety light, 2-CR2032 batteries, quick guide.
2. Setup and Assembly
- Attach Headband: Securely attach the headlamp unit to the comfortable anti-slip headband. Ensure the lamp is facing forward when worn.
- Battery Installation:
- For the Li-Po 2.4Ah battery pack: Connect the battery pack to the headlamp unit. The battery pack can be worn on the back of the head or placed in a pocket using the provided extension cord.
- For AAA batteries: Open the battery compartment and insert 3xAAA batteries, observing correct polarity.
- Charging (Rechargeable Battery): Connect the USB charge cable to the battery pack and a USB power source. The battery indicator will show charging status. A full charge takes approximately 4 hours.
- Safety Light: The included SILVA Tyto safety light can be attached to the headband or clothing for increased visibility in the dark. It uses 2-CR2032 batteries.
3. Operating Instructions
The Silva Trail Runner 4 Ultra features intuitive controls for easy operation.
- Power On/Off: Press and hold the power button located on the side of the headlamp unit for approximately 1 second to turn the headlamp on or off.
- Change Light Modes: While the headlamp is on, short press the power button to cycle through the different light modes:
- High (350 Lumens): For maximum illumination and distance.
- Medium (150 Lumens): Balanced light for general use and extended battery life.
- Low (50 Lumens): For maximum burn time and close-range activities.
- Blink Mode: Some models may include a blink mode for emergency signaling. Refer to the quick guide for specific activation.
- Intelligent Light: The headlamp is equipped with Silva Intelligent Light technology, which optimizes the light pattern by combining a wide flood light for close-up activities and a long-reach spot light for distance vision. This provides clear vision without unnecessary head movements.
4. Maintenance and Care
Proper maintenance ensures the longevity and optimal performance of your headlamp.
- Cleaning: Wipe the headlamp and headband with a damp cloth. Do not use harsh chemicals or abrasive cleaners. Ensure the lamp unit is dry before storage.
- Battery Care:
- For rechargeable batteries, charge fully before long-term storage and recharge every 3-6 months to maintain battery health.
- Remove AAA batteries if the headlamp will not be used for an extended period to prevent leakage.
- Water Resistance: The headlamp is water resistant. Avoid submerging it in water. If it gets wet, dry it thoroughly before storing.
- Storage: Store the headlamp in a cool, dry place away from direct sunlight and extreme temperatures.
5. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Headlamp does not turn on. | Battery is depleted or incorrectly installed. | Charge the rechargeable battery or replace AAA batteries. Ensure correct polarity for AAA batteries. |
| Light is dim or flickers. | Low battery charge. | Recharge or replace batteries. |
| Headlamp turns off unexpectedly. | Battery overheating or low charge. | Allow the unit to cool down. Recharge the battery. |
| Charging indicator not working. | Faulty USB cable or power source. | Try a different USB cable or power adapter. Ensure connections are secure. |
6. Specifications
| Feature | Detail |
|---|---|
| Model Name | Trail Runner 4 Ultra |
| Part Number | 37720 |
| Brightness | 350 Lumens (Max) |
| Light Path Distance | 75 Meters (Max) |
| Power Source | 1 x Li-Po 2.4Ah (Rechargeable) or 3xAAA batteries |
| Recharge Time | 4 hours |
| Battery Cell Composition | Lithium Ion |
| Material | Aluminum (lamp unit) |
| Color | Black |
| Water Resistance Level | Water Resistant |
| Item Package Dimensions | 6.3 x 5.98 x 3.23 inches |
| Package Weight | 0.44 Kilograms |
7. Warranty and Support
This Silva Trail Runner 4 Ultra headlamp comes with a Limited 2-Year Warranty from the date of purchase. This warranty covers manufacturing defects in materials and workmanship under normal use.
For warranty claims, technical support, or further assistance, please contact Silva customer service through their official website or the retailer where the product was purchased. Please have your proof of purchase and product model number (37720) ready when contacting support.
Note: The warranty does not cover damage caused by misuse, accidents, unauthorized modifications, or normal wear and tear.





