MIJIA Portable Electric Air Compressor 2D User Manual

1. Product Overview

The Xiaomi Portable Electric Air Compressor 2D is designed to inflate tires of various vehicles such as bicycles, motorcycles, cars, and electric scooters, as well as different types of balls. It features a 25% speed boost compared to previous models, a high-precision cylinder body, and intelligent pressure detection with automatic stop.

Figure 1: MIJIA Portable Electric Air Compressor 2D

1.1. Key Components

• Schrader Valve Adapter: For general tire valves.
• High-pressure Air Hose: Connects the compressor to the valve.
• Air Hose Compartment: Storage for the air hose.
• Light: For nighttime operation.
• Air Hose Connection: Point where the hose attaches.
• Display: Digital screen showing pressure and modes.
• Heat Dissipation Vent: For cooling during operation.
• + Button: To increase pressure or navigate menus.
• Start/Stop Button: To start or stop inflation.
• Light On/Off Button: To control the built-in light.
• - Button: To decrease pressure or navigate menus.
• Mode Button: To switch between inflation modes.
• Charging Port: Type-C port for charging.

2. Safety Instructions

WARNING!

Read all safety warnings, instructions, illustrations, and guidelines carefully before use. Failure to follow these instructions may result in electric shock, fire, and/or serious injury. Keep this manual for future reference.

2.1. General Safety

• The air compressor is not a toy and should not be used by children. It is recommended that users be 16 years or older. Keep children at a safe distance when the air compressor is working.
• The air compressor produces more than 75 dB of noise when working. Take proper hearing protection measures.
• The air compressor and high-pressure air hose can get very hot after running for a long period. Allow them to cool down before handling.
• Household Use Only. Do not expose to rain or wet conditions. Store indoors.
• Do not operate in explosive atmospheres (flammable liquids, gases, dust).
• Turn off immediately if the air compressor makes unusual noise or starts to overheat.
• Always monitor the air compressor during usage and never leave it unattended, especially when not using a preset pressure.
• Use the air compressor only in a clean, dry environment. Dirt and dust can cause damage. The air compressor is not waterproof and should not be cleaned with water.
• If the air compressor does not function properly, reinsert the air hose and then pull it out again to restart. If issues persist, contact after-sales service.
• Avoid touching the connection between the air hose and the compressor after long periods of operation, as it can get hot and cause burns.

2.2. Battery Safety

• The air compressor has a built-in non-removable lithium-ion battery pack. Do not throw it into fire or discard it.
• Do not expose the battery pack to high temperatures (e.g., leaving it in a car in direct sunlight), extreme heat, impact, or water, as this poses a risk of fire, spontaneous combustion, or explosion.
• Do not store the air compressor at temperatures below -10°C or over 45°C. Extreme temperatures can shorten service life and damage the battery.
• If unused for long periods, charge the air compressor at least once every three months to prevent battery damage.
• Do not disassemble, impact, squeeze, or cut the battery, as it may result in an explosion.
• Do not subject the battery to extremely low air pressure, which could cause an explosion or leakage of flammable liquids or gases.
• Stop using the battery immediately if it shows any swelling.
• Do not swallow the battery to avoid chemical burns. Seek medical aid immediately if ingested.
• Stop using the air compressor if its battery compartment is not closed safely. Keep new and used batteries away from children.
• Dispose of batteries safely according to local laws and regulations, not as household waste.

3. Setup

3.1. Package Contents

• MIJIA Portable Electric Air Compressor 2D x1
• Quick-connect Valve Adapter x1
• Air Needle x1
• Presta Valve Adapter x1
• Storage Pouch x1
• User Manual (Chinese) x1

Figure 2: Package Contents

An English user manual in PDF format is available for download: User Manual (PDF)

3.2. Battery Level Indicator & Charging

Fully charge the air compressor before first use. Connect the charging cable (not included in the Chinese version) to a compatible 5V USB power adapter to charge the compressor.

Figure 3: Digital Display showing battery level and pressure

Battery Level Indication:

• ≥ 75%: Full bars
• 75% > level ≥ 50%: Three bars
• 50% > level ≥ 25%: Two bars
• < 25%: One blinking bar (needs charging)

Charging Status:

• 25% > Battery level: Blinking
• 50% > Battery level ≥ 25%: Blinking
• 75% > Battery level ≥ 50%: Blinking
• 99% > Battery level ≥ 75%: Blinking
• 100% Battery level: Stays on for 20 seconds, then turns off.

Note:

• The air compressor cannot be used while charging.
• A safe and compliant power adapter must be purchased separately.

3.3. Turning On/Off

• Turning On: Remove the high-pressure air hose from its compartment. The compressor will automatically turn on. If not used for 3 minutes, it will automatically turn off. If it auto-offs with the hose out, press and hold the Start/Stop button to turn it on again.
• Turning Off: Insert the high-pressure air hose back into its compartment to turn the compressor off. Alternatively, press and hold the Start/Stop button when the compressor is on.

3.4. Connecting the High-Pressure Air Hose and Valve

The compressor comes with various adapters for different valve types.

Schrader Valve (for mountain bikes, e-bikes, motorcycles, electric scooters, cars)

• To Inflate: Connect the Schrader valve to the Schrader valve adapter on the high-pressure air hose.
• To Deflate: Use an appropriate tool (e.g., a 4 mm hex key) to press the needle valve adapter to release air.

Presta Valve Adapter (for road bikes, some mountain bikes)

• To Inflate: Connect the Presta valve adapter to the Schrader valve adapter on the high-pressure air hose. Unscrew the tire's Presta valve. Connect the Presta valve to the adapter.
• To Deflate: Unscrew the Presta valve's threaded cap and press it down to release air.

Needle Valve Adapter (for balls like basketballs, footballs)

• To Inflate: Screw the needle valve adapter onto the Schrader valve adapter, then insert the needle into the ball's valve.
• To Deflate: Insert the needle valve adapter into the ball's valve to release air.

Quick Connect Valve Adapter (for various tires)

• To Inflate: Connect the quick connect valve adapter to the Schrader valve adapter on the high-pressure air hose. Press the handle down to lock and start inflating.
• To Deflate: Connect the quick connect valve adapter to the Schrader valve and press the quick connect valve adapter down to release air.

4. Operating Instructions

4.1. Detecting Air Pressure

The current air pressure will automatically be displayed on the screen once the high-pressure air hose is connected to an item and the air compressor is turned on.

4.2. Determining the Correct Air Pressure

To ensure safety and prevent injuries or property damage from over-inflation, always refer to the instructions or relevant directions accompanying the item to be inflated to determine the correct required air pressure.

Tire Pressure Reference

Recommended inflation pressure for car, bicycle, electric scooter, and motorcycle tires is indicated on the tire's sidewall. Car tire pressures are also on the driver's side door jamb. Refer to your vehicle's manual for load-specific pressures.

Ball Pressure Reference

Recommended air pressure for footballs, basketballs, volleyballs, and other balls is indicated near the ball's air valve.

Figure 4: Real-time pressure display during ball inflation

Air Pressure Reference Table

Note: The pressure range values are for reference only. Always refer to the instructions or manual of the item being inflated.

4.3. Presetting Pressure

The air compressor offers 6 preset inflation modes. You can switch between them using the Mode button. Press and hold the Mode button to toggle between PSI and BAR units.

• Manual Mode: No mode icon on the display. Adjustable range: 3–150 psi / 0.2–10.3 bar. The set value and unit will be saved.
• Bicycle Mode: Default 45 psi, adjustable range 30–65 psi.
• Motorcycle Mode: Default 2.4 bar, adjustable range 1.8–3.0 bar.
• Car Mode: Default 2.5 bar, adjustable range 1.8–3.0 bar.
• Electric Scooter Mode: Default 50 psi, adjustable range 45–60 psi.
• Ball Mode: Default 8 psi, adjustable range 4–16 psi.

Adjusting the Preset Pressure

After selecting an inflation mode, use the + or - buttons to adjust the preset pressure value. Press and hold for quick adjustment. The number will blink during adjustment and stop when real-time pressure is displayed.

4.4. Light Function

Press the Light On/Off button to cycle through: Light On, SOS Light, and Light Off.

Figure 5: Built-in Lighting for Nighttime Operation

4.5. Inflating

• Start Inflating: Press the Start/Stop button. The display will show real-time pressure changes.
• Stop Inflating: The compressor automatically stops when the preset pressure is reached. You can also manually stop it by pressing the Start/Stop button once.

Caution:

Items like balloons, beach balls, and swim rings cannot automatically stop inflating by presetting pressure because their pressure requirement is below the compressor's minimum range. Inflate these items manually with caution.

4.6. Disconnecting the Air Compressor

The valve adapter and air hose can get hot after inflation. Be careful to avoid burns. Some air may leak out when disconnecting. Disconnect quickly to avoid pressure loss.

5. Specifications

Note: The battery is undetachable.

6. Maintenance

Regular maintenance ensures the longevity and safe operation of your air compressor.

• Have your power tool serviced by a qualified repair person using only identical replacement parts. This ensures the safety of the power tool.
• Never service damaged battery packs. Battery pack service should only be performed by the manufacturer or authorized service providers.
• Keep the air compressor clean and dry. Do not clean with water.
• Charge the air compressor at least once every three months if it is not used for long periods.

7. Troubleshooting

8. User Tips

No specific user tips were provided in the available reviews or Q&A. However, based on the product's features, here are some general tips:

• Always double-check the recommended pressure for your item before inflating to prevent over-inflation or under-inflation.
• Utilize the preset modes for common items like car tires, bicycle tires, and balls for convenience and accuracy.
• Remember to use the built-in light for better visibility when inflating in low-light conditions.
• Keep the various valve adapters organized in the storage pouch to ensure they are readily available when needed.

9. Regulatory Compliance

9.1. EU Declaration of Conformity

We, Shanghai HOTO Technology Co., Ltd., hereby declare that this equipment is in compliance with the applicable Directives and European Norms, and amendments. The full text of the EU declaration of conformity is available at: http://www.mi.com/global/service/support/declaration.html

9.2. UK Declaration of Conformity

We, Shanghai HOTO Technology Co., Ltd., hereby declare that this equipment is in compliance with the applicable Legislation. The full text of the UK declaration of conformity is available at: https://www.mi.com/uk/service/support/declaration.html

9.3. Disposal and Recycling Information

All products bearing this symbol are Waste Electrical and Electronic Equipment (WEEE as in directive 2012/19/EU) which should not be mixed with unsorted household waste. Instead, you should protect human health and the environment by handing over your waste equipment to a designated collection point for the recycling of waste electrical and electronic equipment, appointed by the government or local authorities. Correct disposal and recycling will help prevent potential negative consequences to the environment and human health. Please contact the installer or local authorities for more information about the location as well as terms and conditions of such collection points.

• Read Manual: Before commissioning the device, read the operating manual and observe the safety instructions.
• Wear Ear-muffs: Indicates the need for hearing protection during operation.

9.4. Notes for Packaging

The packaging materials are recyclable. Please dispose of packaging in an environmentally friendly manner.

10. Product Video