Introduction
Thank you for choosing the Clair B3S Portable Air Purifier. This device is designed to provide clean air in your personal space, featuring a compact design, a powerful 4-stage filtration system, and a built-in rechargeable battery for convenience. Please read this manual carefully before using the product to ensure proper operation and maintenance.
Product Features
The Clair B3S Portable Air Purifier incorporates advanced technology to deliver superior air purification:
- High-Performance BLDC Motor: Ensures efficient and quiet operation.
- Optimized Airflow: Utilizes a proprietary fan design for effective air circulation.
- 4-Stage Filtration System: Captures various airborne particles and odors.
- Sterilization LED: Helps to eliminate bacteria and maintain filter performance.
- Built-in Rechargeable Battery: Provides wireless operation for up to 10 hours on low speed.
- Compact and Lightweight Design: Weighs only 270g, making it highly portable.
- 3-Stage LED Air Quality Indicator: Visually displays current air quality (Good, Moderate, Bad).
- Air Quality Sensor: Detects volatile organic compounds (VOCs) such as formaldehyde and toluene.

Image: Overview of Clair B3S key features, including portability, 4-stage filtration, and LED sterilization.
Setup
- Unboxing: Carefully remove the Clair B3S air purifier and all accessories from the packaging.
- Initial Charging: Before first use, fully charge the device. Connect the included USB cable to the charging port on the device and to a USB power adapter (not included) or a computer USB port. The charging indicator will show the charging status. A full charge typically takes approximately 5 hours.

Image: The Clair B3S device illustrating its battery life and charging process. It shows approximately 10 hours of use on low speed after a full charge.
- Filter Check: The 4-stage filter system is pre-installed. Ensure it is securely in place before operation. Refer to the Maintenance section for filter replacement instructions.
Operating Instructions
The Clair B3S is designed for simple operation. All functions are controlled via a single power button.

Image: Diagram showing the power button and LED indicators on the Clair B3S, with instructions for power, fan speed, sterilization, and filter alarm.
- Power On/Off:
- Press the power button once to turn on the device. It will start in Auto mode, and the air quality sensor will analyze the air for approximately 20 seconds. The LED lamp will glow blue/green during this initial check.
- To turn off the device, press and hold the power button for approximately 5 seconds.
- Fan Speed Adjustment:
- After turning on (Auto mode):
- Press the power button a second time: Fan Speed 1.
- Press the power button a third time: Fan Speed 2.
- Press the power button a fourth time: Fan Speed 3.
- Press the power button a fifth time: Turbo Mode. (Note: Turbo mode automatically switches to Fan Speed 3 after 1 hour of operation).
- Sterilization LED On/Off:
- To turn off the sterilization LED while the fan is running, press and hold the power button for approximately 3 seconds. The fan speed will remain unchanged.
- Air Quality Indicator:
The device features a 3-stage LED lamp that indicates the current air quality:
- Green LED: Good air quality.
- Yellow/Green LED: Moderate air pollution.
- Red LED: Bad air quality.

Image: The Clair B3S showing its 3-stage LED lamp for air quality indication (Green for Good, Yellow/Green for Moderate, Red for Bad) and the location of the air quality sensor.
Maintenance
Regular maintenance ensures optimal performance and longevity of your Clair B3S air purifier.

Image: Cross-section diagram of the Clair B3S, illustrating its 4-stage filter system: Pre-filter, HEPA filter, Deodorization filter, and LED Sterilization.
- Filter Replacement:
- The device will indicate when the filter needs replacement with a blinking LED alarm.
- To replace the filter:
- Turn off the device and disconnect it from any power source.
- Twist the bottom cover of the air purifier counter-clockwise to open it.
- Remove the old filter and dispose of it properly.
- Insert a new Clair B3S replacement filter, ensuring it is seated correctly.
- Close the bottom cover by twisting it clockwise until secure.
- After replacing the filter, press and hold the power button for 6 seconds to reset the filter replacement alarm.
- Replacement filters are sold separately.
- Cleaning the Device:
- Wipe the exterior of the device with a soft, dry cloth.
- Do not use abrasive cleaners, solvents, or immerse the device in water.
- Periodically clean the air intake and outlet vents with a soft brush or vacuum cleaner to remove dust buildup.
Troubleshooting
If you encounter any issues with your Clair B3S, please refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not turn on. | Battery is depleted. | Connect the device to a power source using the USB cable and charge it fully. |
| Low airflow or unusual noise. | Filter is clogged or incorrectly installed. | Check the filter for excessive dust. Replace the filter if necessary and ensure it is installed correctly. Clean air intake/outlet vents. |
| LED air quality indicator always red. | High level of air pollution detected or sensor malfunction. | Ensure the device is operating in a well-ventilated area. If the issue persists in clean environments, contact customer support. |
| Filter replacement alarm (blinking LED) does not reset. | Reset procedure not followed correctly. | After replacing the filter, press and hold the power button for 6 seconds until the alarm resets. |
If the problem persists after trying these solutions, please contact Clair customer support.
Specifications

Image: Detailed table of technical specifications for the Clair B3S Portable Air Purifier.
| Feature | Detail |
|---|---|
| Brand | Clair |
| Model Number | B3S |
| Manufacturer | CLAIR, Inc. |
| Product Dimensions | 7 x 7 x 18 cm (2.76 x 2.76 x 7.09 inches) |
| Item Weight | 0.27 kg (0.6 lbs) |
| Color | White |
| Power Source | Battery Powered |
| Rated Voltage | DC 5V / 1.0A |
| Power Consumption | 4W |
| Battery Type | Lithium Polymer |
| Battery Capacity | 1400mAh / 3.7V DC |
| Noise Level | 31.4 dB |
Warranty and Support
The Clair B3S Portable Air Purifier comes with a 1-year warranty from the date of purchase. This warranty covers manufacturing defects and malfunctions under normal use.
For warranty claims, technical support, or any inquiries regarding your product, please contact Clair customer service through the retailer where you purchased the device or visit the official Clair website for contact information.
Please retain your proof of purchase for warranty validation.