Sofirn SP31 V3.0 Tactical Flashlight User Manual

1. Setup

1.1. In the Box

• Sofirn SP31 V3.0 Flashlight
• 18650 Battery (3000mAh)
• Type-C Charging Cable
• Lanyard
• Spare O-rings
• User Manual (this document)

1.2. Battery Installation

The flashlight comes with a pre-installed 18650 battery. Before first use, please open the tail cap and remove the insulating film (cardboard piece) from the battery's negative terminal. Ensure the battery is inserted with the positive (+) end facing towards the flashlight head.

1.3. Charging

The SP31 V3.0 features a convenient USB Type-C charging port. To charge the battery:

1. Locate the USB Type-C port on the side of the flashlight, covered by a rubber flap.
2. Open the rubber flap.
3. Connect the provided USB Type-C cable to the flashlight and plug the other end into a USB power source (e.g., computer, USB wall adapter).
4. The charging indicator light will show:
   • Red (Flashing): Charging (Battery 15-30%)
   • Red (Constant): Charging (Battery 30-70%)
   • Green (Constant): Fully Charged (Battery 70-100%)
5. A full charge takes approximately 2 hours.
6. When the battery voltage drops below 2.7V, the flashlight will automatically shut down to protect the battery.

Figure 1: Convenient USB-C Charging with indicator lights.

Figure 2: USB Type-C Charging Status.

2. Operating Instructions

2.1. Product Overview

The Sofirn SP31 V3.0 is a powerful tactical flashlight featuring a high-powered LED (SST40 or 519A depending on model) and a dual-switch design for versatile operation. It offers various brightness levels and special modes.

Figure 3: Tactical Flashlight with Dual Switches.

2.2. On/Off

• From OFF: Fully press the Tactical Tail Switch to turn the flashlight ON. Fully press again to turn OFF.
• From ON: Fully press the Tactical Tail Switch to turn the flashlight OFF.

2.3. Mode Switching (Side Switch)

When the flashlight is ON (via the tail switch):

• Single Click the Side Switch to cycle through brightness modes: Low → Medium → High → Turbo.
• The flashlight will memorize the last used brightness level (except for special modes) when turned off and back on.

2.4. Special Modes (Strobe/SOS/Beacon)

When the flashlight is ON (via the tail switch):

• Long Press the Side Switch to activate Strobe mode.
• While in Strobe mode, Single Click the Side Switch to cycle through: Strobe → SOS → Beacon.
• To exit special modes, Long Press the Side Switch again, or turn the flashlight OFF via the tail switch.

2.5. Moonlight Mode

When the flashlight is OFF:

• Press and Hold the Side Switch, then Click the Tactical Tail Switch to activate Moonlight mode.

2.6. Dual Switch Operation Flowchart

Figure 4: SP31 V3.0 Dual Switches Operation Flowchart.

3. Maintenance

• Cleaning Threads: Periodically clean the threads of the flashlight with a soft cloth and apply a thin layer of silicone grease to maintain smooth operation and waterproof integrity.
• O-Rings: For maintaining adequate waterproof performance, inspect the O-rings regularly. Replace them with the supplied spare ones if they appear damaged or worn.
• Battery Care: If the flashlight will not be used for a long time (e.g., several months), please remove the battery to prevent potential leakage and damage.
• Accidental Activation Prevention: To avoid accidental activation during storage or transport, loosen the tail cap by half a turn or remove the battery.

4. Troubleshooting

• Flashlight Not Turning On:
  • Check if the battery is inserted correctly with the positive (+) end towards the head.
  • Ensure the insulating film has been removed from the battery.
  • Verify the battery is charged. If the battery level is low, the flashlight may not turn on or will automatically shut down.
  • Tighten the tail cap and head firmly to ensure good electrical contact.
  • Clean the battery contacts and flashlight threads with a clean cloth.
• Mode Switching Issues:
  • Ensure the battery is sufficiently charged. Low battery can affect mode stability.
  • Clean the side switch area for any debris that might interfere with its operation.
• Overheating: The flashlight may get hot on higher brightness settings (High, Turbo). This is normal. If it becomes too hot, the flashlight has a temperature regulation feature that will automatically step down the brightness to prevent damage.

5. Specifications

Figure 5: Flashlight Dimensions.

Figure 6: Performance Parameters by Mode.

Figure 7: IP68 Waterproof Feature.

6. User Tips

• Heat on High Settings: The flashlight can get quite hot on the brightest (High/Turbo) settings. This is normal due to the high power output.
• Momentary Tail Switch: The tactical tail switch allows for momentary activation, which can be useful for quick signaling or temporary illumination.
• Color Temperature Preference: Many users prefer the 5000K LED version for its natural color rendition, which can be better for identifying objects accurately.
• Versatile Use: With an optional silicone light diffuser (not included), the flashlight can be used as a small lamp or night light.
• Troubleshooting Tip: If the flashlight doesn't turn on, try removing and reinserting the battery, ensuring the protective cap (if any) is removed and contacts are clean.
• Water Test: The flashlight is IP68 rated. Some users have successfully tested it in water, but always ensure all caps are tightly sealed and O-rings are in good condition before exposing it to water.

7. Warranty and Support

Sofirn products are manufactured to high-quality standards. For any warranty claims, technical support, or inquiries regarding your Sofirn SP31 V3.0 Tactical Flashlight, please contact the seller or Sofirn customer service directly. Please retain your proof of purchase for warranty purposes.