1. Introduction
Thank you for choosing the Alonefire SV125 UV Flashlight. This versatile device is designed for a wide range of detection and authentication tasks, utilizing both 365nm and 395nm ultraviolet wavelengths. Its compact design, USB Type-C charging, and intelligent LCD display make it a reliable tool for both professional and home use. Please read this manual carefully to ensure proper operation and maintenance of your flashlight.

Alonefire UV Flashlight with 365nm/395nm options, 5W power, Type-C charging, and intelligent LCD display.
2. Specifications
| Attribute | Value |
|---|---|
| Model Number | SV125 |
| Brand Name | Alonefire |
| Function | UV |
| Light Source | LED bulbs (UV led) |
| Wattage | 5w |
| Lumen | 450 |
| Body Material | Aluminum alloy |
| Color | Black |
| Charger | Rechargeable (Built-in lithium battery) |
| Charging Method | TYPE-C CHARGING |
| Input Voltage | 5V |
| Work Mode | 1 mode (Single File) |
| Working Time | About 2 hours (may vary with battery capacity/temperature) |
| Dimensions | 11cm (length) x 2.6cm (head) x 2.6cm (tail) |
| Net Weight | About 82g / 0.18 Lb (Flashlight only) |
| Waterproof | No |
| Zoom | No |
| Focal Length | Non-adjustable |
| Lighting Distance | < 50 m |
| Certification | CE, ROHS |
3. Setup and Charging
3.1 Unpacking
Upon receiving your Alonefire SV125 UV Flashlight, please check the package contents:
- 1 x Alonefire SV125 UV Flashlight
- 1 x USB Charging Cable
- 1 x Box

Packing list for the 395nm UV flashlight, showing the flashlight, USB charging cable, and box.
3.2 Charging the Flashlight
The SV125 UV Flashlight features a built-in lithium battery and a convenient Type-C charging port. To charge:
- Locate the Type-C charging port on the flashlight.
- Connect the provided USB charging cable to the flashlight's Type-C port.
- Connect the other end of the USB cable to a compatible 5V power source, such as a wall charger, power bank, laptop, or car charger.
- The intelligent LCD display will show the charging progress. When it displays "100%", the flashlight is fully charged.

Close-up of the Type-C charging port and intelligent LCD display showing battery percentage.

Various charging methods for the UV flashlight, including power bank, wall charger, laptop, and car charger.
4. Operating Instructions
4.1 Power On/Off
The flashlight operates in a single mode. To turn it on or off, press the power button located near the charging port.
4.2 Wavelength Options (365nm vs 395nm)
The Alonefire SV125 is available in two main wavelength options: 365nm and 395nm. Each wavelength has distinct characteristics and applications:
- 395nm UV Flashlight: Emits a stronger purple light, making it ideal for general detection tasks such as pet stains (dog, cat, rodent urine), bed bug detection, and scorpion hunting. The purple light is more visible to the naked eye.
- 365nm UV Flashlight: Emits less visible purple light, offering stronger penetration and better identification effects. It has a wider range of specialized uses, including fungal detection, authenticity identification (passports, currency, licenses, cards), fine mark detection, and UV glue curing.
For optimal results, especially for subtle detections, it is recommended to use the UV flashlight in a dark environment.

Comparison of 395nm (purple light) and 365nm (less visible purple light) UV wavelengths. Note the difference in visible purple light and the clarity of fluorescence.

Visual comparison of 395nm (transparent lenses) and 365nm (black lenses) UV flashlights.
5. Common Applications
The Alonefire SV125 UV Flashlight is a versatile tool for various tasks:
- Pet Stain Detection: Easily spot dried urine stains from dogs, cats, and other pets on carpets, rugs, and furniture.
- Scorpion Hunting: Scorpions glow brightly under UV light, making them easy to locate in dark environments.
- Authenticity Verification: Check security features on currency, passports, driver's licenses, and other official documents.
- Fluorescent Agent Detection: Identify fluorescent whitening agents in cosmetics, baby products, and clothing.
- Mineral and Ore Detection: Observe fluorescence in certain minerals and ores.
- Leak Detection: Detect leaks in HVAC systems, automotive systems, and other machinery when used with UV dye.
- UV Glue Curing: Accelerate the curing process of UV-sensitive adhesives.
- Cat Ringworm Detection: Identify ringworm on cats, which fluoresces under UV light.

Various applications for the UV flashlight, including ore detection, body art, leak detection, scorpion detection, pet urine, and fluorescent agent identification.

UV flashlight detecting pet stains on a carpet, showing the glow in the dark effect.

UV flashlight used as a cat ringworm detector, highlighting fluorescent areas on a cat's fur.

Diagram illustrating the uses of the SV125 365nm UV blacklight flashlight for various detection tasks.
Video Demonstration
Product demonstration video showcasing the Alonefire UV flashlight's features, including charging, UV light activation, and various detection applications on minerals, a sink, food items, and a UV sensor card.
6. Maintenance
- Cleaning: Wipe the flashlight body with a soft, damp cloth. Do not use abrasive cleaners or solvents. Keep the lens clean for optimal light output.
- Storage: Store the flashlight in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: Recharge the battery regularly, even if not in frequent use, to prolong its lifespan. Avoid fully discharging the battery for extended periods.
- Water Resistance: This flashlight is NOT waterproof. Avoid exposing it to water or high humidity to prevent damage.
7. Troubleshooting
- Flashlight does not turn on:
- Ensure the battery is charged. Check the LCD display for battery level.
- Verify the power button is pressed firmly.
- Light is dim or flickers:
- The battery may be low. Recharge the flashlight.
- Ensure the lens is clean and free from obstructions.
- Flashlight does not charge:
- Check the USB cable for damage and ensure it is properly connected to both the flashlight and the power source.
- Try a different USB power adapter or port.
8. User Tips
- For best detection results, especially for faint stains or subtle fluorescence, use the flashlight in a completely dark room.
- When checking for pet stains, move the flashlight slowly over the suspected area. Stains will often glow yellow, green, or blue.
- Always point the UV light away from your eyes and avoid direct exposure to skin.
- Keep the flashlight handy for quick checks of hotel rooms, public restrooms, or rental properties for cleanliness.
9. Warranty and Support
Alonefire products are manufactured to high-quality standards. For any issues or questions regarding your SV125 UV Flashlight, please contact the seller or manufacturer's customer support. Keep your purchase receipt as proof of purchase for any warranty claims.



