How to Use SMART PUMP P4
User Guide
Brand: LEXIN
Product Overview
The LEXIN SMART PUMP P4 is a portable digital air pump designed for various inflation needs, including tires, balls, and inflatables. It features a clear digital display, multiple pressure units, preset pressure settings, and a built-in rechargeable battery.
Contact Information
For customer service related to LEXIN products purchased on Amazon Germany:
? Phone Hotline: (Only for LEXIN customer on Amazon Germany) Germany: 0160 2141903
To contact the seller on Amazon:
- Go to your order history.
- Click "Problems with Order" and select the reason.
- Select "Contact Seller", enter your message, and click Send.
Product Details
Product Information
| Product Model | SMART AIR PUMP P4 |
|---|---|
| USB-C Input | 5V/2A |
| USB-A Output | 5V/2A |
| Product Net Weight | 427g |
| Battery Power/Voltage | 14.8Wh/7.4V |
| Product Size | 155*68*42mm |
| Inflation Pressure | 2~150PSI / 0.1~10.3BAR |
| Battery Capacity | 3.7V/4000mAh |
| Operating Temperature | -10°C to +45°C |
Scope of Delivery
- SMART Air Pump
- American Hose
- Adapter for French Nozzle
- User Manual
- Ball Needle
- USB-C Charging Cable
- Storage Bag
- Cone Adapter
Function Introduction
The pump features a hose connector, LED lighting, USB-C input, and USB-A output.
Basic Operation
Power On/Off
Press and hold the [power button] for 3 seconds to turn the device on or off.
Inflation
Briefly press the [power button] while the device is on to start inflation. The process automatically stops when the preset pressure is reached.
Battery Status Display
The indicator color shows different battery levels:
- Green: 70%-100%
- Yellow: 30%-70%
- Red: 5%-30%
- Flashing Red: Below 5% (charge the pump before use).
Charging
The USB-C charging input is 5V/2A. Use the included cable to connect a power adapter (sold separately) and the pump to charge.
Charging indicator: Flashing green means charging. Solid green light means fully charged.
❗Attention: The pump cannot be used while charging.
[Not included in scope of delivery]
[Included in scope of delivery]
Advanced Features
Switching Pressure Unit
Press the `U` button to cycle through units (PSI, BAR, KPA, Kg/cm²). Conversion formulas:
- 1 PSI = 6.89 KPA
- 1 BAR = 100 KPA
- 1 KG/cm² = 90 KPA
LED Lighting
Press and hold the ❖ button for approximately 3 seconds to turn LED lighting on/off or cycle through modes.
There are three lighting modes:
- Continuous lighting
- Flashing mode
- SOS mode
❗Attention: In SOS mode, press and hold the ❖ button for approximately 3 seconds to deactivate the lighting.
Preset Pressure
Press the `–` or `+` button to adjust the preset pressure by 0.5 PSI per click.
Press and hold the `–` or `+` button to adjust the preset pressure faster.
Measuring Pressure
When the device is on and the hose is connected to the object (tire/ball/inflatable/air mattress) for inflation, the upper half of the display shows the current measured pressure.
Current Measured Pressure: 16.5 PSI
Preset Pressure: 38.0 PSI
Reset and Scenarios
Reset Pressure
After turning on, before connecting the hose, if the measured pressure is not 0.0, press and hold the `+` and `–` buttons simultaneously for 2 seconds. The pump will reset to normal after the display lights up.
❗Note: The pump is factory reset. Manual reset can improve accuracy due to altitude or sensor differences. Calibration at high temperatures is not recommended.
Switching Application Scenarios
Tap the ❖ button to select from 5 scenarios:
| Scenario Mode | Preset Value | Adjustable Range |
|---|---|---|
| Ball | 8 PSI | 2-15 PSI |
| Bicycle | 38 PSI | 2-150 PSI |
| Motorcycle | 2.7 BAR | 0.1-3.7 BAR |
| Car | 2.4 BAR | 0.1-4.4 BAR |
| Custom | 100 PSI | 2-150 PSI |
Inflation Guides
Inquire Pressure
For safety, determine the required pressure for the object before inflating by reading its instructions or other sources to avoid injury from over-inflation.
Connecting Hose with Nozzle
American Valve
Mountain bikes, e-scooters, motorcycles, and cars use American valves.
Inflation: Connect the American nozzle to the American hose for inflation.
French Nozzle
For inflating racing bikes and individual mountain bikes, a French nozzle adapter is needed.
- Connect the French nozzle adapter to the American nozzle connector on the high-pressure hose.
- Unscrew the French valve cap from the tire.
- Connect the French nozzle to the adapter for inflation.
Ball Needle
Use the ball needle for inflating balls like basketballs and footballs.
Inflation: After securely attaching the ball needle and the American nozzle connector, insert the needle into the ball's air hole to inflate.
Power Bank Function
The pump's intelligent battery capacity is 4000 mAh, and the 5V/2A USB-A output port can charge electronic devices like mobile phones.
❗Note: Inflation and charging cannot occur simultaneously.
Pressure Values for Common Products
| Product Category | Product Type | Pressure Range |
|---|---|---|
| Bicycle | Stroller | 18-30 PSI |
| 10-16 inch Tires | 30-45 PSI | |
| 20-30 inch Tires | 38-55 PSI | |
| Racing Bike | 100-120 PSI | |
| Small Balance Bike #9 | 40-60 PSI | |
| Wheelchair Helper | 30-45 PSI | |
| Motorcycle | Motorcycle/Electric Bike | 1.8-3.0 BAR |
| Car | 2.2-2.8 BAR | |
| Ball | Toy Ball for Children | 3-6 PSI |
| Basketball | 7-9 PSI | |
| Football | 10-12 PSI | |
| Volleyball | 4-6 PSI | |
| Rugby | 10-14 PSI |
Safety Information
- Do not leave unattended during inflation.
- Do not place the pump near flammable or explosive materials.
- Avoid sand entering or falling into the pump.
- Do not place the pump in excessively cold, hot, or humid environments.
- The pump has a built-in lithium battery; do not throw it into fire or dispose of it improperly.
- Keep this product out of reach of children.
Precautions at High Temperatures
When unscrewing the hose, the nozzle and the hose connection point will be hot due to prolonged operation. Avoid touching them for extended periods.
Troubleshooting
Slow Inflation Speed
Troubleshooting Method:
- Check if the battery is fully charged.
- Check the hose for leaks.
- Ensure connection parts at both ends of the hose are tightened.
- Check if the inflated object is leaking.
Device Turned On But Cannot Inflate
Troubleshooting Method:
- Check if the battery is fully charged.
- Check if the current tire pressure is higher than the preset value.
Preset Pressure Value Cannot Be Increased or Decreased
Troubleshooting Method: Check if the pump is in the wrong inflation mode. Select the custom mode to adjust the preset value within the 2-150 PSI range.
Inflates Normally, But Pressure Shows Zero
Troubleshooting Method:
- Low-pressure items (like balloons) may be outside the pump's measurement range.
- For a flat tire, pressure may be displayed after a short inflation.
Pump Automatically Shuts Off After Connecting Nozzle
Troubleshooting Method: It automatically shuts off after 3 minutes. Press and hold the [power button] to turn it back on.
Leak When Connecting Hose
Troubleshooting Method: Tighten the hose securely.
Battery Indicator Color Differs Between Inflation and Standby States
Troubleshooting Method: The lithium battery experiences a significant voltage drop during discharge, causing the battery indicator color to appear inconsistent between inflation and standby states. This is not a fault.
Battery Indicator Does Not Light Up During Charging
Troubleshooting Method: Replace with a safe and compliant charging cable and adapter.
