1. Introduction
Thank you for choosing the XMSJ ST17-Silver Portable Tire Inflator. This smart air pump is designed for convenient and efficient inflation of various items, including car tires, motorcycle tires, bicycle tires, and sports balls. Featuring a digital pressure gauge, LED light, and Type-C charging, it offers a compact and versatile solution for your inflation needs.
2. Safety Information
Please read and understand all safety instructions before using this product. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Keep out of reach of children.
- Do not operate the inflator in wet conditions or near flammable liquids or gases.
- Ensure the correct pressure unit and target pressure are set to avoid over-inflation.
- Do not leave the inflator unattended while in operation.
- Avoid prolonged continuous use to prevent overheating. Allow the device to cool down between uses if necessary.
- Do not point the inflation nozzle at people or animals.
- Use only the provided or recommended accessories.
3. Package Contents
Verify that all items are present in your package:
- XMSJ ST17-Silver Portable Tire Inflator
- USB Type-C Charging Cable
- Various Inflation Nozzles (e.g., Presta valve adapter, ball needle, general nozzle)

4. Specifications
| Feature | Specification |
|---|---|
| Brand Name | XMSJ |
| Model | ST17-Silver |
| Power Source | AC (via Type-C charging) |
| Voltage | 12V |
| Max Pressure | 150 PSI |
| Battery Capacity | 6000mAh (Rechargeable Lithium Battery) |
| Weight | Approx. 0.9 pounds |
| Dimensions (L x W x H) | Approx. 20cm x 20cm x 20cm |
| Inflation Modes | 5 (Car, Motorcycle, Bike, Ball, Custom) |
| Pressure Units | 4 (PSI, BAR, KPA, Kg/cm²) |
| Accuracy | ±1 PSI |
| LED Light Modes | Normal, Emergency, Strobe |
| Charging Port | Type-C |
| Output Port | USB (for emergency power bank function) |
5. Setup
5.1 Charging the Inflator
Before first use, fully charge the inflator. Connect the provided Type-C charging cable to the inflator's Type-C port and plug the other end into a compatible USB power adapter (not included).
- The battery indicator on the display will show charging status.
- A full charge typically takes a few hours.
- The 6000mAh battery provides sufficient power for multiple inflations.

5.2 Attaching the Inflation Hose and Nozzle
- Screw the inflation hose securely onto the inflator's air outlet.
- Select the appropriate nozzle for the item you wish to inflate.
- Attach the selected nozzle to the free end of the inflation hose.
6. Operating Instructions
Follow these steps for efficient and accurate inflation:
- Connect Valve: Securely connect the appropriate nozzle to the item's valve (e.g., tire valve).
- Turn On: Press the power button to turn on the inflator. The LCD display will illuminate, showing the current pressure and default settings.
- Select Mode & Unit:
- Press the 'M' button to cycle through the 5 preset inflation modes: Car, Motorcycle, Bike, Ball, and Custom.
- In each mode, you can adjust the pressure unit (PSI, BAR, KPA, Kg/cm²) by pressing the unit selection button (often indicated by a symbol like a gear or 'U').
- Set Target Pressure: Use the '+' and '-' buttons to adjust the desired target pressure. The digital display shows the real-time pressure and the preset target pressure.
- Press to Start Inflation: Once the target pressure is set, press the power button again to start inflation. The inflator will automatically shut off when the preset target pressure is reached.


6.1 Fast Inflation
The inflator is equipped with a powerful motor for quick inflation. For example, it can inflate a 195/65R15 car tire from 0 to 32-36 PSI in approximately 1 minute.

6.2 Using the LED Light
The built-in LED light can be activated for various purposes:
- Normal Light: For illuminating dark work areas, such as when inflating tires at night.
- Emergency Light: A steady, bright light for signaling or general illumination in emergencies.
- Strobe Light: A flashing light for attracting attention in emergency situations.

6.3 Power Bank Function
The inflator can also serve as an emergency power source. Connect your electronic device (e.g., smartphone) to the inflator's USB output port using a compatible charging cable to charge it.
7. Maintenance
Proper maintenance ensures the longevity and optimal performance of your tire inflator.
- Cleaning: Wipe the exterior of the inflator with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners. Ensure no water enters the charging ports or air outlet.
- Storage: Store the inflator in a cool, dry place, away from direct sunlight and extreme temperatures. Keep the inflation hose and nozzles organized to prevent damage.
- Battery Care: For optimal battery life, charge the device at least once every three months if not in regular use. Avoid fully discharging the battery for extended periods.
8. Troubleshooting
If you encounter issues with your inflator, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Inflator does not turn on | Low battery; Device malfunction | Charge the inflator fully. If still unresponsive, contact support. |
| Inflator runs but does not inflate | Hose/nozzle not securely attached; Valve blocked; Leak in hose/nozzle | Ensure all connections are tight. Check for obstructions in the valve. Inspect hose and nozzles for damage. |
| Inaccurate pressure reading | Incorrect pressure unit selected; Sensor issue | Verify the correct pressure unit (PSI, BAR, KPA, Kg/cm²) is selected. If the issue persists, contact support. |
| Device overheats and shuts off | Prolonged continuous use | Allow the inflator to cool down for at least 15-20 minutes before resuming use. |
9. User Tips
- Always check the recommended pressure for your tires or items before inflation. This information is usually found on the tire sidewall, vehicle door jamb, or item's manual.
- For car tires, it's best to check and adjust pressure when tires are cold (before driving).
- Keep the various nozzles organized in a small pouch to avoid losing them.
- The LED light is very useful in low-light conditions; remember to use it when needed.
- The power bank feature is for emergency use; it's not intended as a primary charging device.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.





