Introduction
Thank you for choosing the HLS 550ML Aroma Diffuser. This device combines the functions of an essential oil diffuser, humidifier, ambient night light, and vaporizer to create a peaceful and comfortable living space. Featuring a large 550ML capacity, 7 ambient light colors, and multiple timer settings, it is designed for ease of use and long-lasting performance. Please read this manual thoroughly before operation to ensure proper use and maintenance.

Image: The HLS 550ML Aroma Diffuser, showcasing its elegant design and vibrant ambient light band.
Important Safety Information
Please observe the following safety precautions to prevent damage to the product or personal injury:
- Do not add water over the MAX line indicated inside the water tank. Overfilling may result in low mist output or leakage.
- Essential oils are NOT included with this product. Please purchase them separately.
- Do not press the 'MIST' button when the water tank is empty. This can damage the ultrasonic plate.
- Always ensure the diffuser is placed on a flat, stable surface away from direct sunlight or heat sources.
- Keep out of reach of children and pets.
- Only use the provided power adapter.

Image: The diffuser operating quietly in a bedroom, highlighting its safe and peaceful operation with automatic shut-off.
Package Contents
Please check the package for the following items:
- 1 x HLS 550ML Aroma Diffuser (Model: H-D-033)
- 1 x Power Adapter
- 1 x User Manual
Setup
Follow these steps for initial setup:
- Placement: Place the diffuser on a flat, stable, and water-resistant surface. Ensure it is not near any electronic devices or furniture that could be damaged by moisture.
- Remove Cover: Gently remove the top cover of the diffuser.
- Add Water: Fill the water tank with clean tap water up to the MAX water level line. Do not exceed this line.
- Add Essential Oils (Optional): Add 3-5 drops of your preferred essential oil directly into the water tank. Adjust the amount based on your preference and room size.
- Replace Cover: Securely place the top cover back onto the diffuser. Ensure it is properly aligned.
- Connect Power: Plug the power adapter into the DC jack at the bottom of the diffuser, then plug the other end into a standard wall outlet.
Operation
The HLS Aroma Diffuser features two main control buttons: 'MIST' and 'LIGHT'.
Image: A visual guide to the diffuser's two control buttons, illustrating their functions for mist and light settings.
Mist Control
Press the 'MIST' button to cycle through the timer settings and continuous mode:
- First Press: 1 Hour timer (1H)
- Second Press: 3 Hour timer (3H)
- Third Press: 6 Hour timer (6H)
- Fourth Press: Continuous mist (ON)
- Fifth Press: Turn off mist
The diffuser will automatically shut off when the water level is too low, regardless of the timer setting.
Image: The diffuser demonstrating its four time modes, suitable for various activities like reading, yoga, working, and sleeping.
Light Control
Press the 'LIGHT' button to control the ambient lighting:
- First Press: Turn on the ambient light. The colors will cycle automatically through 7 different colors.
- Second Press: Fix the current color.
- Subsequent Presses: Change to the next color in the cycle.
- Long Press (2 seconds): Turn off the light.
Image: The diffuser highlighting its 7 color light options and key specifications.
Maintenance
Regular cleaning is essential for optimal performance and longevity of your diffuser.
Daily Maintenance
- After each use, unplug the diffuser and empty any remaining water from the tank.
- Wipe the inside of the water tank with a clean, soft cloth.
Weekly Cleaning
- Unplug the diffuser and remove the cover.
- Add about 10ml of white vinegar to the water tank.
- Let it sit for 5-10 minutes to loosen any mineral buildup.
- Drain the vinegar from the side opposite the air outlet to avoid getting liquid into the air vent.
- Gently wipe the ultrasonic plate with a cotton swab or soft brush to remove any residue. Do not use harsh chemicals or abrasive materials.
- Rinse the tank with clean water and wipe dry with a soft cloth.
- Ensure all parts are completely dry before reassembling or storing.
Troubleshooting
If you encounter any issues, please refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No mist or weak mist | Low water level; Water over MAX line; Ultrasonic plate dirty; Air outlet blocked. | Add water to appropriate level; Empty excess water; Clean ultrasonic plate; Ensure air outlet is clear. |
| Diffuser not turning on | No power; Adapter not connected properly. | Check power outlet; Ensure adapter is securely plugged into diffuser and wall. |
| Light not working | Light function off. | Press the 'LIGHT' button to turn on or cycle through colors. |
| Water leakage | Overfilled water tank; Cover not properly secured. | Do not exceed MAX water line; Ensure cover is securely placed. |
Specifications
Key technical specifications for the HLS Aroma Diffuser:
- Model Name: H-D-033
- Capacity: 550 Milliliters
- Runtime: Up to 10 hours (continuous mode)
- Coverage Area: Up to 300 Square Feet
- Noise Level: Approximately 30dB
- Power Source: Corded Electric
- Wattage: 12 watts
- Product Dimensions: 6"L x 6"W x 7"H
- Special Features: Automatic Shut-Off, Cool Mist, Large Capacity, Timer Setting (1H/3H/6H/ON)
- Light Source Type: LED (7 colors)
- Material: Plastic
- Item Weight: 1.1 pounds (0.5 Kilograms)
Image: The diffuser's quiet operation, rated at 30dB, ensuring a peaceful environment for sleep.
Warranty and Support
HLS is committed to providing high-quality products. For any questions, concerns, or technical support regarding your HLS Aroma Diffuser, please contact our customer service. Refer to the product packaging or the HLS official website for contact information.




