1. Introduction
Thank you for choosing the SOBO USB Outdoor AC/DC Oxygen Pump. This manual provides important information for the safe and efficient operation of your oxygen pump. Please read it thoroughly before use and keep it for future reference.
This portable and silent oxygen pump is designed to provide essential aeration for fish tanks, especially during power outages, for outdoor fishing, or during transportation of aquatic life. It features a rechargeable lithium battery and multiple charging options for convenience.
2. Safety Information
- Always ensure the pump is placed in a dry area, away from water splashes.
- DO NOT immerse the oxygen pump in water. It is designed for external use only.
- If the pump must be placed below the water level of the tank, a check valve MUST be installed on the air line to prevent water backflow, which can damage the pump.
- Keep out of reach of children.
- Use only the provided USB cable for charging.
- Do not attempt to open or repair the pump yourself. Contact customer support if issues arise.
- Unplug the pump from the power source before performing any maintenance.
3. Package Contents
Please check the package for the following items:
- SOBO Oxygen Pump (SB-168, SB-268, or other specified model)
- USB Charging Cable (approx. 100cm)
- Air Hose (approx. 80cm per root)
- Air Stone (Bubble Ball)
- Check Valve (recommended for safe operation, may be included or sold separately)
- Adhesive Hook (for mounting)


4. Setup Instructions
- Unpack: Carefully remove all components from the packaging.
- Connect Air Hose and Air Stone:
- Attach one end of the air hose to the air outlet(s) on the oxygen pump.
- Attach the air stone (bubble ball) to the other end of the air hose.
- For SB-268 (Diplopore model), repeat for the second air outlet if desired.
- Placement:
- For optimal safety, place the oxygen pump above the water level of your fish tank. This prevents water backflow into the pump.
- If placing the pump below the water level, you must install a check valve on the air hose between the pump and the air stone. This prevents water from siphoning back into the pump during a power outage or when the pump is off, which can cause severe damage.
- Secure the Pump: Use the adhesive hook provided to secure the pump to a suitable surface, ensuring it is stable and dry.
- Initial Charging: Before first use, fully charge the oxygen pump. Refer to the "Charging the Battery" section for details.
- Submerge Air Stone: Place the air stone at the bottom of your fish tank.

5. Operating Instructions
5.1 Power On/Off
Press the power button (usually indicated by a universal power symbol) on the top panel of the pump to turn it on or off.

5.2 Battery Indicator
The pump features LED indicator lights to show the battery charge level:
- One light on: Approximately 10% charge remaining.
- Two lights on: Approximately 40% charge remaining.
- Three lights on: Approximately 70% charge remaining.
- All four lights on: 100% charged.

5.3 Charging the Battery
The oxygen pump is equipped with a rechargeable lithium battery. To charge:
- Locate the USB charging port on the side of the pump.
- Connect the provided USB charging cable to the pump.
- Connect the other end of the USB cable to a suitable USB power source, such as:
- A power bank
- A laptop or computer USB port
- A car charger
- A standard USB wall adapter (US Plug, 110-240V compatible)
- The battery indicator lights will illuminate and show charging progress. All four lights will be solid when fully charged.


A full charge can provide up to 15 hours of continuous operation or over 30 hours of intermittent use (for SB-268 model with 2200mAh battery).
6. Maintenance
- Cleaning: Wipe the exterior of the pump with a soft, dry cloth. Do not use harsh chemicals or immerse in water.
- Air Stone: Periodically check the air stone for blockages. If the bubble output decreases, clean or replace the air stone.
- Air Hose: Inspect the air hose for kinks, cracks, or blockages. Replace if necessary.
- Storage: When not in use for extended periods, ensure the pump is fully charged and stored in a cool, dry place. Recharge every 3-6 months to maintain battery health.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Pump does not turn on. | Battery is depleted. | Charge the pump using the USB cable. |
| No or low air output. |
|
|
| Water backflow into pump. | Pump placed below water level without a check valve. | Immediately disconnect power. Dry the pump thoroughly. Install a check valve or reposition the pump above water level. |
| Pump is noisy. | Vibration or internal issue. | Ensure pump is on a stable, flat surface. Check for any loose connections. If noise persists, contact customer support. |
8. Specifications
The SOBO Oxygen Pump series offers various models with different power outputs and features. Please refer to the table below for detailed specifications:

| Feature | SB-168 | SB-268 | SB-368 | SB-468 | SB-568 |
|---|---|---|---|---|---|
| Power (W) | 1W | 2W | 6W | 12W | 12W |
| Gas Volume | 3L/min | 2*3L/min | N/A | N/A | N/A |
| Air Outlet | Single hole | Diplopore | N/A | N/A | N/A |
| Suitable for Fish Tank | 30-50L | 30-100L | N/A | N/A | N/A |
| Size (L*W*H) | 11*7*3.8cm | 11*8*4cm | N/A | N/A | N/A |
| USB Cable Length | 100cm | 100cm | N/A | N/A | N/A |
| Battery Capacity (SB-268) | N/A | 2200mAh | N/A | N/A | N/A |
| Battery Life (SB-268) | N/A | Up to 15 hours (continuous), 30+ hours (intermittent) | N/A | N/A | N/A |
| Voltage | 110-240V | ||||
| Material | Plastic | ||||
| Tube Calibre | 0.5 cm | ||||
| Battery Included | Yes (Internal Rechargeable Lithium Battery) | ||||
| High-concerned chemical | None | ||||
Note: "N/A" indicates information not explicitly provided for these models in the source data.
9. User Tips
- Assembly: The air hose and air stone are typically easy to connect. Ensure a snug fit to prevent air leaks.
- Check Valve Importance: As highlighted in the safety section, if your pump is ever below the water level, a check valve is crucial to prevent water damage. It's a small investment for significant protection.
- Portability: The compact design and rechargeable battery make this pump ideal for temporary uses like transporting fish or providing aeration during fishing trips.
- Power Outages: Keep your pump charged as a reliable backup during unexpected power failures to ensure continuous oxygen supply for your aquatic pets.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the seller's contact information or the product packaging. Keep your purchase receipt as proof of purchase.
This product is designed for durability and performance. Should you encounter any issues not covered in this manual, please reach out to the retailer or manufacturer for assistance.





