Introduction
This manual provides detailed instructions for the safe and efficient operation of your Yaledi V21B Pro Aromatherapy Essential Oil Diffuser. Please read this manual thoroughly before use and retain it for future reference.
The Yaledi V21B Pro is a 560ml ultrasonic cool mist diffuser and humidifier featuring unique flame and volcano mist modes, multiple lighting options, and convenient remote control. It is designed to enhance your environment with aromatherapy and humidification.
Product Features
- Volcano Shape & Flame Light: Unique design with ambient flame lighting, creating a visual effect of a burning volcano. Functions as a diffuser, ornament, or night light.
- 3 Lighting Modes & 2 Misting Modes: Offers red, blue, or cyclic gradient lighting. Choose between flame and volcano mist modes. Fog output is adjustable via a rotary switch.
- Ultrasonic Atomization & Quiet Working: Utilizes ultrasonic technology for fine mist diffusion, spreading essential oil molecules quickly. Operates quietly at less than 35 decibels.
- 560ml Large Capacity & Automatic Power-Off Protection: Provides up to 18 hours of continuous diffusion. Features a built-in smart chip for automatic shut-off when water levels are low.
- Remote Control: Includes a remote control (battery included) for adjusting lighting, misting modes, and timing functions.
Safety Information
Please observe the following safety precautions to prevent injury or damage to the product:
- Avoid direct skin contact with undiluted essential oils.
- Keep the diffuser out of reach of children and pets.
- Ensure proper ventilation in the area where the diffuser is used.
- Always follow all manufacturer instructions for safe operation.
- Do not exceed the maximum water fill line.
- Use only clean tap water or distilled water.
- Unplug the device before cleaning or refilling.
Package Contents
Upon unpacking, please ensure all items are present and in good condition:
- Yaledi V21B Pro Diffuser Unit
- Remote Control (with 1 CR2032 battery included)
- USB Power Cable
- User Manual

Figure 1: Package Contents
Setup Instructions
- Place the diffuser on a flat, stable surface away from direct sunlight or heat sources.
- Remove the top cover of the diffuser.
- Fill the water tank with clean tap water or distilled water up to the 560ml maximum fill line. Do not overfill.
- Add 2-3 drops of your preferred essential oil directly into the water tank (optional).
- Replace the top cover securely.
- Connect the USB power cable to the diffuser and then to a suitable power adapter (not included) or USB port.

Figure 2: Adding water and essential oils
Operating Instructions
Using the Remote Control
The remote control allows for convenient adjustment of the diffuser's functions:
- ON/OFF Button: Press to power on. Short press again to switch mist gears. Short press a third time to power off.
- Light Button: Short press to switch to blue light. Short press again for gradient mode. Short press a third time to turn off the light. Short press again to switch to red light.
- Mist Mode Button: Boot default volcano mode. Short press to switch to flame mode.
- Timing Button: Short press for 3-hour timer. Short press again for 6-hour timer. The corresponding indicator light will illuminate.
- Gear Button (+/-): Adjusts the mist output intensity.

Figure 3: Remote Control Operating Instructions
Mist Modes
The diffuser offers two distinct mist modes:
- Flame Mode: Produces a wider mist output (approx. 30ML/h) that interacts with the flame light effect.
- Volcano Mode: Produces a more concentrated, upward mist output (approx. 5-10ML/h), mimicking a volcano eruption.

Figure 4: Flame Mode vs. Volcano Mode
Lighting Modes
Choose from three lighting options to suit your mood:
- Red Light: A steady red glow.
- Blue Light: A steady blue glow.
- Cyclic Gradient: Alternates between red and blue colors.

Figure 5: Dual-Color Ambient Lighting
Video Demonstration
Watch this video for a visual guide on setting up and operating your Yaledi V21B Pro diffuser:
Video 1: Yaledi 560ml Volcano Flame Diffuser Humidifier Demonstration. This video shows the diffuser in operation, including filling with water, adding essential oils, and demonstrating mist and light functions.
Maintenance
Regular cleaning ensures optimal performance and longevity of your diffuser:
- Unplug the diffuser from the power source.
- Remove the top cover and empty any remaining water from the tank.
- Wipe the inside of the water tank with a soft cloth. For stubborn residue, use a cotton swab dipped in white vinegar to gently clean the ultrasonic plate.
- Rinse the tank with clean water, being careful not to get water into the air outlet.
- Wipe the exterior of the diffuser with a soft, dry cloth.
- Allow all parts to air dry completely before reassembling or storing.
Note: Do not use harsh detergents, abrasive cleaners, or corrosive liquids, as these may damage the diffuser.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No mist or weak mist |
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| Diffuser does not turn on |
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| Remote control not working |
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Specifications
- Brand: Yaledi
- Model Name: V21B Pro (Essential Oil Diffuser with Flame & Volcano 2 Mist Mode)
- Capacity: 560 Milliliters
- Product Dimensions: 6.38"L x 6.38"W x 5.04"H
- Item Weight: 0.99 Pounds (15.8 ounces)
- Power Source: Corded Electric
- Wattage: 12 watts
- Material: Plastic
- Auto Shutoff: Yes
- Special Features: 2 Misting Modes, 3 Lighting Modes, Quiet Working & Timing Function, Ultrasonic Atomization, Volcano Shape & Flame Light, Remote Control
- Recommended Uses: Bedroom, Home, Nursery, Office, Yoga
- Light Source Type: LED
- Coverage: Medium to Large Room
- Batteries: 1 CR2032 battery required (included for remote)
Warranty and Support
For warranty information or technical support, please refer to the contact details provided with your purchase or visit the official Yaledi website. Keep your purchase receipt as proof of purchase.





