Xiaomi Portable Electric Air Compressor 2
User Manual
Safety Instructions
⚠️ WARNING! Carefully read all safety warnings, instructions, illustrations, and guidelines specified in this user manual. The air compressor will produce more than 75 dB of noise when working, so please take proper protection measures. The air compressor and high-pressure air hose can get very hot after running for a long period, so please let them cool down before use. The air compressor is not a toy and should not be used by children. Household Use Only. To reduce the risk of electric shock, do not expose to rain. Store indoors.
Product Overview
The Xiaomi Portable Electric Air Compressor 2 can inflate the tires of bicycles, motorcycles, cars, electric scooters, and balls. For a detailed list, please refer to the product sales page or consult Xiaomi customer service.
Key Components:
- Schrader Valve Adapter
- High-pressure Air Hose
- Air Hose Compartment
- Light ?
- Air Hose Connection
- Display
- Heat Dissipation Vent
- ➕ Button
- Start/Stop Button
- Light On/Off Button
- ➖ Button
- Mode Button
- Charging Port
Accessories
The following accessories are included:
- Presta Valve Adapter
- Needle Valve Adapter
- Storage Pouch (contains an inner bag for storing adapters)
- Quick Connect Valve Adapter
How to Use
Battery Level Indicator & Charging
Battery Level Indicator: The display shows the battery level with multiple bars. A full indicator means 75% or more battery, three bars mean 50%-75%, two bars mean 25%-50%, and one bar means less than 25% (needs charging).
Charging
Please fully charge the air compressor before first use. Connect the charging cable to a compatible 5V USB power adapter. Charging status indicators show battery level progress. The air compressor cannot be used while charging. A safe and compliant power adapter must be purchased separately.
Turning On/Off
Turning On: Remove the high-pressure air hose from its compartment; the compressor turns on automatically. It will auto-off after 3 minutes of inactivity. 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 it off. Alternatively, press and hold the start/stop button while it's on.
Connecting the High-Pressure Air Hose and Valve
Schrader Valve
Used for tires on mountain bikes, e-bikes, motorcycles, electric scooters, and 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
Needed for road bikes and certain 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 the threaded cap down to release air.
Needle Valve Adapter
Used for inflating balls like basketballs and 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
Used for tires on mountain bikes, e-bikes, motorcycles, electric scooters, and cars (Schrader valve type).
- To inflate: Connect the quick connect valve adapter to the Schrader valve adapter on the high-pressure air hose. Connect the quick connect valve to the Schrader valve and press the handle down to lock it.
- To deflate: Connect the quick connect valve adapter to the Schrader valve and press the adapter down to release air.
Detecting Air Pressure
The current air pressure is displayed automatically after the high-pressure air hose is connected and the compressor is turned on.
Determining the Correct Air Pressure
To prevent injuries and property damage from over-inflation, refer to the item's instructions or accompanying directions to determine the correct air pressure required before inflating.
Tires
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 weight recommendations.
Balls
Recommended air pressure for footballs, basketballs, volleyballs, and other balls is indicated near the ball's air valve.
Air Pressure Reference Table
| Category | Type | Recommended Pressure Range |
|---|---|---|
| Bicycles | 12", 14" and 16" bicycle tires | 30–50 psi/2.0–3.4 bar |
| 20", 22" and 24" bicycle tires | 40–50 psi/2.7–3.4 bar | |
| 26", 27.5" and 29" mountain bike tires | 45–65 psi/3.1–4.5 bar | |
| Xiaomi electric scooter tires | 45–60 psi/3.1–4.1 bar | |
| 700c road bike clincher tires | 100–130 psi/6.9–9.0 bar | |
| 700c road bike tubular tires | 120–145 psi/8.3–10 bar | |
| Motorcycles | Motorcycle or electric scooter tires | 1.8–3.0 bar/26–43.5 psi |
| Cars | Car tires | 2.2–2.8 bar/32–40.6 psi |
| Balls | Basketball | 7–9 psi/0.48–0.62 bar |
| Football | 8–16 psi/0.55–1.1 bar | |
| Volleyball | 4–5 psi/0.28–0.34 bar | |
| Football | 12–14 psi/0.83–0.97 bar |
Note: The pressure range values are for reference only. Please refer to the instructions or manual of the item being inflated.
Presetting Pressure
Switching Mode
Press the mode button to cycle through six inflation modes. Press and hold the mode button to toggle between psi and bar for the preferred air pressure unit. Manual mode has no mode icon; the preset air pressure can be adjusted freely and saved.
- Adjustable range: 3–150 psi/0.2–10.3 bar
- Bicycle mode: 45 psi by default (Adjustable range: 30–65 psi)
- Motorcycle mode: 2.4 bar by default (Adjustable range: 1.8–3.0 bar)
- Car mode: 2.5 bar by default (Adjustable range: 1.8–3.0 bar)
- Electric scooter mode: 50 psi by default (Adjustable range: 45–60 psi)
- Ball mode: 8 psi by default (Adjustable range: 4–16 psi)
Adjusting the Preset Pressure
After selecting an inflation mode, press the ➕ or ➖ button to increase or decrease the preset pressure value. Press and hold the button for quick adjustment. The number blinks during adjustment and stops when real-time pressure is displayed.
Light
Press the light on/off button to cycle through light on, SOS light, and light off.
Inflating
Start Inflating
Press the start/stop button to begin inflating. The display shows real-time pressure changes.
Stop Inflating
The air compressor automatically stops when the preset pressure is reached. It can also be manually stopped by pressing the start/stop button once.
Caution
Items like balloons, beach balls, and swim rings may not auto-stop inflating due to low pressure requirements. Inflate these items manually with caution.
Battery Information
The air compressor's battery lasts approximately 25 minutes on a full charge under no load at 25°C. Heavy load or lower ambient temperatures may reduce battery life.
Disconnecting the Air Compressor
The valve adapter and air hose can be hot after inflating. Be careful to avoid burns. Some air may leak when disconnecting. Disconnect quickly to avoid pressure loss.
Cautions
- Not a toy; recommended for users 16 years or older. Keep children and bystanders at a safe distance.
- Built-in non-removable lithium-ion battery. Do not expose to fire, high temperatures, impact, or water, as this risks fire, combustion, or explosion.
- Do not store below -10°C or above 45°C. Extreme temperatures shorten service life and damage the battery.
- Charge at least once every three months if unused for long periods.
- DC motor may produce sparks; do not use in flammable/explosive environments.
- Turn off immediately if unusual noise or overheating occurs.
- Always select the correct air pressure unit before setting pressure to prevent accidents.
- Common unit conversions: 1 bar ≈ 14.5 psi, 1 bar = 100 kPa, 1 psi ≈ 6.89 kPa.
- Monitor during use; do not leave unattended without preset pressure to avoid over-inflation.
- Use only in a clean, dry environment. Dirt can cause damage. Not waterproof; do not clean with water.
- If malfunctioning, reinsert and remove the air hose to restart. Contact after-sales service if issues persist.
- Use Xiaomi MDY-12-EQ chargers or equivalent with compliant cables. Warranty does not cover charging issues from non-compliance.
- Hose connection gets hot during prolonged use; avoid touching.
General Power Tool Safety Warnings
Read all safety warnings and instructions. Failure to follow may result in electric shock, fire, or serious injury. Save for future reference. "Power tool" refers to both corded and battery-operated tools.
Work Area Safety
- Keep work area clean and well-lit.
- Do not operate in explosive atmospheres (flammable liquids, gases, dust) as sparks can ignite them.
- Keep children and bystanders away; distractions can lead to loss of control.
Electrical Safety
- Ensure power tool plugs match outlets; never modify plugs.
- Avoid contact with grounded surfaces (pipes, radiators) to reduce electric shock risk.
- Do not expose to rain or wet conditions.
- Do not abuse the cord; keep away from heat, oil, sharp edges. Damaged cords increase shock risk.
- Use outdoor-suitable extension cords for outdoor operation.
- Use RCD-protected supply in damp locations.
Personal Safety
- Stay alert, use common sense. Do not use when tired or under the influence of drugs/alcohol/medication.
- Use personal protective equipment (eye protection, dust mask, safety shoes, hard hat, hearing protection).
Power Tool Use And Care
- Prevent unintentional starting: ensure the switch is off before connecting to power or battery, or picking up/carrying.
- Remove any adjusting key or wrench before turning on.
- Do not overreach; maintain proper footing and balance.
- Dress properly: avoid loose clothing, jewelry, long hair near moving parts.
- Ensure dust extraction facilities are connected and used if provided.
- Use the correct power tool for the application.
- Do not use if the switch is faulty.
- Disconnect power/battery before adjustments, accessory changes, or storage.
- Store idle tools out of reach of children; do not allow untrained users to operate.
- Maintain tools and accessories: check for misalignment, binding, breakage. Repair if damaged.
- Keep cutting tools sharp and clean.
- Use tools and accessories according to instructions, considering working conditions.
Battery Tool Use and Care
- Recharge only with the manufacturer-specified charger.
- Use only specifically designated battery packs.
- Keep battery packs away from metal objects (paper clips, coins, keys) when not in use to prevent shorting.
- Avoid contact with ejected battery liquid; flush with water if contact occurs. Seek medical help for eye contact.
- Do not use damaged or modified battery packs.
- Do not expose battery packs or tools to fire or excessive temperatures (above 130°C / 265°F).
- Follow charging instructions and do not charge outside specified temperature ranges.
Service
- Have tools serviced by qualified personnel using identical replacement parts.
- Never service damaged battery packs; only manufacturer or authorized providers.
Battery Safety
- Only use manufacturer-approved batteries.
- Do not place batteries in high-temperature environments (direct sunlight, fire, ovens).
- Do not disassemble, impact, squeeze, or cut batteries.
- Do not subject batteries to extremely low air pressure.
- Stop using immediately if battery swells.
- Do not swallow batteries; seek medical aid immediately if swallowed.
- Stop using the compressor if the battery compartment is not closed safely. Keep away from children.
- Keep new and used batteries away from children.
- Dispose of batteries safely according to local laws, not as household waste.
Troubleshooting
| Issues | Solutions |
|---|---|
| The air compressor does not turn on. | 1. Check if the air hose is removed from its compartment. 2. Fully charge the air compressor and turn it on. |
| The inflation speed is slow. | 1. Check battery power. 2. Check for air hose leaks. 3. Ensure both ends of the air hose are securely connected. 4. Check if the inflated item is leaking. |
| The air compressor turns on but does not inflate. | 1. Check battery power. 2. Check if current air pressure is higher than the preset value. |
| The preset pressure cannot be increased or decreased. | Ensure the air compressor is in the correct inflation mode. Manual mode allows adjustment between 3-150 psi. |
| The air compressor inflates normally but the displayed pressure is zero. | The pressure of low-pressure inflatables (e.g., balloons) is too low to measure. |
| The air compressor has already turned off after connecting the air hose to a valve. | Press and hold the start/stop button to turn the air compressor on again. |
| The air leaks out when connecting the air hose. | Make sure the air hose is securely connected. |
| The battery level indicator on the display does not light up while charging. | Replace the charging cable and adapter with safe and compliant ones, and charge again. |
Specifications
- Name: Xiaomi Portable Electric Air Compressor 2
- Model: MJCQB06QW
- Item Dimensions: Approx. 123 x 75.5 x 45.8 mm (Compressor only, excluding hose)
- Net Weight: Approx. 490 g
- Inflation Pressure: 0.2–10.3 bar/3–150 psi
- Operating Temperature: -10°C to 45°C
- Charging Temperature: 5°C to 40°C
- Storage Temperature: -10°C to 45°C
- Air Hose Dimensions: Length 200 mm (Includes Schrader valve adapter)
- Valve Adapter Dimensions (Inside Diameter):
- Schrader Valve Adapter: Ø6.9 mm
- Presta Valve Adapter: Ø6 mm
- Quick Connect Valve Adapter: Ø6.9 mm
- Battery Type: Lithium-ion battery
- Rated Capacity: 2000 mAh (14.4 Wh)
- Operating Noise: Less than 80 dB at 1 m
- Input: 5 V ⎓ 2A
- Charging Port: Type-C
- Charging Time: Approx. 3 hours
- Sensor Accuracy: ±1 psi
Noise and Vibration Emissions
Declaration of noise emission values according to EN 62841:
- Sound pressure level: 76.8 dB(A) (uncertainty 3 dB(A))
- Sound power level: 87.8 dB(A) (uncertainty 3 dB(A))
Declaration of vibration emission according to EN 62841:
- Vibration total value: 4.33 m/s² (uncertainty 1.5 m/s²)
Information: Declared values are measured per standard test methods for comparison and preliminary exposure assessment.
Warning: Actual emissions may differ based on usage. Safety measures should be based on estimated exposure conditions.
The battery is undetachable.
Regulatory Compliance Information
Europe - EU Declaration of Conformity
Shanghai HOTO Technology Co., Ltd. declares this equipment complies with applicable EU Directives and European Norms. Full text available at: www.mi.com/global/service/support/declaration.html
UK Declaration of Conformity
Shanghai HOTO Technology Co., Ltd. declares this equipment complies with applicable UK Legislation. Full text available at: www.mi.com/uk/service/support/declaration.html
Disposal and Recycling Information
This symbol indicates WEEE (Waste Electrical and Electronic Equipment). Do not mix with household waste. Dispose of at designated collection points to protect health and environment. Correct disposal prevents negative consequences. Contact local authorities for collection point details.
Before commissioning, read the operating manual and observe safety instructions! Wear ear-muffs! ?
Notes for Packaging
Packaging materials are recyclable. Please dispose of them in an environmentally friendly manner.
Federal Communications Commission Supplier's Declaration of Conformity
Product: Xiaomi Portable Electric Air Compressor 2
Model Number(s): MJCQB06QW
Brand/Trade: Xiaomi
This device has been tested and found compliant with CFR 47 Part 15 Regulation.
This device complies with part 15 of the FCC Rules, subject to two conditions: (1) it may not cause harmful interference, and (2) it must accept any interference received, including interference that may cause undesired operation.
Note: Tested and found to comply with limits for a Class B digital device. Designed for reasonable protection against harmful interference in residential installations. Generates, uses, and radiates RF energy. If not installed/used per instructions, may cause radio interference. No guarantee against interference in a particular installation. If interference occurs, try to correct it by:
- Reorienting or relocating the receiving antenna.
- Increasing separation between equipment and receiver.
- Connecting equipment to a circuit different from the receiver's.
- Consulting a dealer or experienced radio/TV technician.
Responsible Party – U.S. Contact Information
Company: TEKMOVIL LLC
Address: 601 BRICKELL KEY DR #723 Miami, FL 33131
Country: U.S.A.
Telephone No.: +1(312)282-5246
Internet contact information: kim.peterson@tekmovil.com
Representative of Responsible Party for SDoC
Company: Shanghai HOTO Technology Co., Ltd.
Address: Building 45, No.50 Moganshan Road, Shanghai, China
Country: China
Telephone No.: 400-021-8696
Manufactured for: Xiaomi Communications Co., Ltd.
Manufactured by: Shanghai HOTO Technology Co., Ltd. (a Mi Ecosystem company)
Address: Building 45, No. 50 Moganshan Road, Shanghai, China
For further information, please go to www.mi.com
User Manual Version: V1.0
Importer:
Beryko s.r.o.
Pod Vinicemi 931/2, 301 00 Plzeň
