1. Introduction
The Sofirn SD06 is a high-performance scuba diving flashlight designed for underwater exploration and various outdoor activities. It features a powerful LED, multiple brightness levels, and robust waterproof construction to ensure reliable operation in challenging environments. This manual provides essential information for the safe and effective use of your SD06 flashlight.

Image: The Sofirn SD06 Scuba Diving Flashlight, showcasing its compact and durable design.
2. Package Contents
Please check the package for the following items:
- 1 x Sofirn SD06 Flashlight
- 1 x 21700 Lithium Polymer Battery (pre-installed)
- 1 x External Battery Charger
- 1 x USB-A to USB-C Charging Cable
- 2 x Spare O-rings
- 1 x Lanyard

Image: All items included in the Sofirn SD06 package: flashlight, battery, charger, cable, O-rings, and lanyard.
3. Setup
3.1 Battery Installation
Before first use, unscrew the tail cap and remove the insulation paper from the battery. Ensure the battery is inserted with the positive (+) end facing the flashlight head. Screw the tail cap back on tightly to ensure a waterproof seal.
Video: Demonstrates the unboxing and initial setup, including battery installation and removal of insulation paper.
3.2 Lanyard Attachment
Attach the provided lanyard to the tail cap loop for secure handling. Thread the thin loop of the lanyard through the hole in the tail cap, then pass the larger part of the lanyard through the thin loop and pull tight to secure.
4. Operating Instructions
4.1 Power On/Off
- To Turn On: Single-click the side push-button switch. The flashlight will turn on in the last used brightness mode (memory mode).
- To Turn Off: Long-press the side push-button switch.
4.2 Brightness Level Adjustment
When the flashlight is on, single-click the side push-button switch to cycle through the brightness levels: Low (300 lumens) → Medium (1100 lumens) → High (3200 lumens).

Image: Illustration of the three brightness modes: Low (300 lumens), Medium (1100 lumens), and High (3200 lumens).
4.3 Lockout Mode
The SD06 features a convenient lockout mode to prevent accidental activation, conserving battery life and ensuring the light is ready when needed.
- To Lock: Rotate the side push-button switch to the locked position (indicated by a lock symbol).
- To Unlock: Rotate the side push-button switch to the unlocked position (indicated by an unlocked symbol).

Image: Visual guide demonstrating how to engage and disengage the lockout mode by rotating the switch.
5. Features
- Powerful Focused Beam: Delivers an impressive 3200 lumens with a 62° focusing angle, illuminating up to 472 meters.
- Deep Waterproof Rating: Designed for underwater use up to 100 meters, with double waterproof O-rings.
- 6500K Cool White Light: Penetrates underwater environments effectively, restoring true colors and offering high visibility.
- Durable Construction: Made from aluminum alloy with a high transparent tempered glass lens.

Image: An exploded view of the Sofirn SD06 highlighting its SFT70 LED, double waterproof O-rings, magnetic switch, aluminum alloy body, and tempered glass lens.
Video: A short demonstration showcasing the impressive brightness of the Sofirn SD06 Diving Torch underwater.
6. Usage Scenarios
The Sofirn SD06 is highly versatile and suitable for a wide range of activities:
- Scuba Diving
- Snorkeling
- Underwater Photography
- Cave Diving
- Night Diving
- Hiking
- Camping
- Other Outdoor Adventures

Image: Collage showing the Sofirn SD06 being used for diving, hiking, camping, and caving.
7. Maintenance
- Regularly clean the threads and O-rings with a clean cloth.
- Lubricate the O-rings periodically with silicone grease to maintain the waterproof seal.
- Replace O-rings if they are damaged or worn.
- Keep the flashlight and battery away from direct sunlight or high temperatures.
- Store the flashlight with the tail cap slightly loosened to prevent accidental activation and battery drain during long periods of inactivity.
8. Troubleshooting
8.1 Low Power Warning
When the battery level is low, the main light will flash twice per minute to indicate that the battery needs to be recharged or replaced.

Image: A diver using the flashlight underwater, with a text overlay indicating the low power warning signal.
9. Specifications
| Feature | Specification |
|---|---|
| Brand | sofirn |
| Model | SD06 |
| Light Source Type | LED (SFT70) |
| White Brightness | 3200 Lumens (Max) |
| Beam Distance | 472 Meters (Max) |
| Color Temperature | 6500K (Cool White) |
| Water Resistance Level | Waterproof (up to 100 meters) |
| Material | Aluminum Alloy |
| Power Source | Battery Powered (1 x 21700 Lithium Polymer) |
| Item Weight | 4.4 ounces (excluding battery) |
| Product Dimensions | 1.57 x 1.57 x 3.15 inches |
| Beam Angle | 62 Degrees |

Image: Diagram illustrating the dimensions of the Sofirn SD06 flashlight.
10. Warranty and Support
For warranty information, technical support, or any inquiries regarding your Sofirn SD06 flashlight, please refer to the official Sofirn website or contact their customer service directly. Keep your purchase receipt as proof of purchase.

