How to Use Smart Pump P4
User Guide
LEXIN
Product Information
Product Model: Smart Pump P4
Battery Capacity: 3.7V/4000mAh
Pressure Range: 2~150 PSI / 0.1~10.3 BAR
USB-C Input/USB-A Output: 5V/2A
Product Dimensions: 155*68*42MM
Battery Charge: 14.8Wh/7.4V
Product Net Weight: 427G
Working Temperature: -10 ~ 45°C
Product Packaging
- Smart air pump
- USB-C charging cable
- Ball needle
- Presta valve adapter
- Storage bag
- American style quick-connect trachea
- User guide
- Floating nozzle for swimming pool and other
Function Introduction
Tracheal Interface
LED Light
USB-C Input Port
USB-A Output Port
Real-time Air Pressure
Battery Indicator
Usage Scene Display
Mode/LED Light Setting
Air Pressure Unit Switching
Air Unit
Preset Air Pressure
Power Button
Preset +
Preset -
Basic Operation
Power On/Off
Power On: Press and hold the power button for 3 seconds to turn on the air pump.
Power Off: Press and hold the power button for 3 seconds to turn off the air pump.
Pumping Method
When the pump is on, briefly press the power button to start inflating. It will automatically stop when the preset air pressure is reached.
Battery Indicator
- Green: 70%~100%
- Yellow: 30%~70%
- Red: 5%~30%
- Flashing Red: Less than 5% (low battery warning, please charge)
Charging Method
Use the USB-C charging port (5V/2A) with a charging cable and connect it to a power adapter (sold separately) to charge the air pump.
Charging Indicator:
- Flashing green light: Charging
- Solid green light: Fully charged
Note: The air pump cannot be used while charging.
Air Pressure Unit Switching
Briefly press the 'U' button to switch between PSI, BAR, KPA, and Kg/cm².
Unit Conversion Formulas: 1PSI = 6.89KPA; 1BAR = 100KPA; 1Kg/cm² = 98KPA;
LED Light
Press and hold the power button to turn on the LED light. Pressing it again cycles through three lighting modes: flashlight, strobe, and SOS. Press and hold again to turn off the LED light.
Preset Air Pressure
Briefly press the '+/-' buttons to adjust the preset air pressure by 0.5 PSI per press.
Press and hold the '+/-' buttons to quickly adjust the preset air pressure.
Checking Air Pressure
With the air pump in standby and the trachea connected to the object, the upper half of the display shows the current measured air pressure.
Measured air pressure: 16.5 PSI
Preset air pressure: 38.0 PSI
Resetting Pressure
If the trachea is not connected to an inflatable object and the measured pressure is not 0.0, press and hold the '+' and '-' buttons simultaneously for 2 seconds. The display will return to normal after all screen indicators light up.
Note: The default pressure value has been reset. Due to differences in altitude or sensors, manual resetting can improve accuracy if the measured air pressure is not zero. Calibration is not recommended at high temperatures.
Application Scene Switching
Briefly press the button to select from 5 preset inflation modes:
| Scene Mode | Default Preset Value | Adjustable Range |
|---|---|---|
| Balls | 8PSI | 2-15PSI |
| Bicycle | 38PSI | 2-150PSI |
| Motorcycle | 2.7BAR | 0.1-3.7BAR |
| Motor Vehicle | 2.4BAR | 0.1-4.4BAR |
| Custom | 100PSI | 2-150PSI |
Checking Inflation Pressure
For safety, check the required inflation pressure in the instruction manual of the item to be inflated before inflating to avoid personal injury due to over-inflation.
Connecting the Air Hose to the Air Valve
Schrader Valves
Mountain bikes, electric bikes, motorcycles, and motor vehicles are equipped with Schrader valves. Connect the Schrader valve to the American style quick-connect trachea to inflate.
Diagram: American style quick-connect trachea connected to a Schrader valve.
Presta Valves
When inflating road bikes and some mountain bikes, a Presta valve adapter is required.
- Connect the Presta valve adapter to the Schrader valve of the high-pressure air trachea.
- Unscrew the cap of the Presta valve.
- Connect the Presta valve to the adapter for inflation.
Diagram: American style quick-connect trachea with Presta valve adapter connected to a Presta valve.
Ball Valves
Ball valves are needed for inflating balls such as basketballs and footballs. After connecting the ball valve to the Schrader valve of the air trachea, insert the ball valve into the gas-filled port on the ball to inflate.
Diagram: American style quick-connect trachea connected to a ball valve, which is inserted into a ball.
Power Bank
The Smart air pump's battery capacity is 4000mAh, and the 5V/2A USB-A output interface can be used to charge electronic devices such as mobile phones.
Note: Inflation and charging cannot be performed simultaneously.
Common Air Pressure Values for Articles
| Category of Product | Type of Product | Pressure Range |
|---|---|---|
| Bicycle | Children's bikes | 18~30PSI |
| 10-16 Inch Tires | 30~45PSI | |
| 20-30 Inch Tires | 38~55PSI | |
| Road bikes | 100~120PSI | |
| Pedal-less bikes | 40~60PSI | |
| Wheelchair | 30~45PSI | |
| Motorcycle/Electric Motorcycle | Motorcycle/Electric Motorcycle | 1.8~3.0BAR |
| Motor Vehicle | Automobiles | 2.2~2.8BAR |
| Ball | Children's toy ball | 3~6PSI |
| Basketball | 7~9PSI | |
| Football | 10~12PSI | |
| Volleyball | 4~6PSI | |
| Rugby ball | 10~14PSI |
Attention
- Do not leave unattended during inflation.
- Please do not place the air pump near flammable and explosive materials.
- Try to avoid sand ingress and falling.
- Do not place the product in a place that is too cold, too hot, or too humid.
- This product contains a built-in lithium battery; it is forbidden to throw it into fire or dispose of it at will.
- Keep this product out of reach of children.
High Temperature Safety Precautions
When the trachea is unscrewed, the trachea and its joint will generate high temperatures due to prolonged operation. Please do not touch it with your hands for a long time.
Diagram: Shows high temperature warning symbol near the trachea connection.
Troubleshooting
| Problem | Exclusion Method |
|---|---|
| Inflating too slowly | 1. Check if the power is sufficient. 2. Check if the air hose has gas leakage. 3. Check if the connections at both ends of the trachea are tight. 4. Check if the inflated object has a gas leak. |
| Cannot inflate | 1. Check if the power is sufficient. 2. Check if the current tire pressure is higher than the preset value. |
| Cannot increase or decrease the preset pressure value | Check if the pump is in the correct inflation mode. Select the custom mode to adjust the preset value within the range of 2-150 PSI. |
| Inflates correctly but the pressure value shows zero | 1. Low-pressure products such as balloons are not within the measurable range of the device. 2. For an empty tire, a short period of inflation is required to display the tire pressure value. |
| The air pump automatically turns off after connecting the trachea | It will automatically turn off after 3 minutes. Press and hold the power button to turn it back on. |
| There is a leak when connecting the trachea | Tighten the trachea. |
| The color of the power indicator in the inflation state is inconsistent with the standby state | The lithium battery has a significant voltage drop during discharge, leading to the phenomenon that the charging indicator color and standby state are not consistent. This is not a defect. |
| The power indicator does not turn on after charging | Replace with a safe and compliant charging cable and adapter for charging. |
