1. Important Safety Instructions
Please read and understand all safety instructions before operating your Cotsoco Aroma Diffuser. Keep this manual for future reference.
- Always place the diffuser on a stable, flat, and water-resistant surface.
- Keep the diffuser out of reach of children and pets.
- Use only the provided power adapter. Using an incompatible adapter may damage the unit or pose a safety risk.
- Do not immerse the diffuser unit or its power cord in water or any other liquid.
- Ensure the air outlet is not blocked during operation.
- Unplug the diffuser from the power outlet before cleaning, refilling, or when not in use.
- Use only pure tap water or distilled water. Do not use hot water.
- Add only 100% pure essential oils. Avoid corrosive liquids or chemicals.
- Do not touch the ultrasonic atomizing chip with bare hands or sharp objects.
- If the diffuser emits an unusual smell or sound, or if smoke appears, unplug it immediately.
2. Product Overview
2.1. Package Contents
Upon unpacking, please ensure all the following items are present:
- Cotsoco Aroma Diffuser Host (1 unit)
- User Manual (1 unit)
- Power Cord (1 unit)
- Salt Box (containing Himalayan Crystal Salt) (1 unit)

Figure 1: Package Contents
2.2. Key Features
- Realistic Flame Effect: Creates a soothing visual ambiance.
- Ultrasonic Atomization: High-frequency technology breaks water molecules to diffuse essential oils effectively.
- Ultra-Quiet Operation: Operates at a low noise level of 20-25dB for undisturbed relaxation.
- Automatic Power-Off Protection: Built-in intelligent chip detects low water levels and automatically shuts off for safety.
- Multiple Timer Settings: Includes 1-hour, 3-hour, and 6-hour timer options.
- Colorful LED Lighting: Offers both fixed color and automatic color-changing light modes.
- 250ml Capacity: Provides long-lasting mist for up to 18 hours.
- Himalayan Crystal Salt: Enhances the environment by releasing negative ions.

Figure 2: Ultrasonic Atomization Technology

Figure 3: Ultra-Quiet Operation and Timing Function
3. Setup and Assembly
Follow these steps to set up your aroma diffuser for first use:
- Unpack: Carefully remove all components from the packaging.
- Placement: Place the diffuser on a firm, level, and water-resistant surface.
- Remove Cover: Gently lift the top cover of the diffuser.
- Add Water: Fill the water tank with clean tap water or distilled water. Do not exceed the maximum water level indicated by the LED light bead. (Approximately 250ml capacity).
- Add Essential Oil: Add 2-3 drops of your preferred essential oil directly into the water tank. Adjust the quantity based on your preference.
- Insert Salt Crystals: Place the Himalayan crystal salt pieces into the designated salt tray at the bottom of the diffuser.
- Replace Cover: Securely place the top cover back onto the diffuser.
- Connect Power: Connect the power cord to the diffuser's power input port, then plug the adapter into a standard electrical outlet.

Figure 4: Diffuser Components and Water Level Guide
Important Notes:
- Use the adaptor included in the package or a DC 5V 2A output adaptor. Using less than 2A output might reduce the light and atomization effect.
- Do not fill water over the max level line (LED light bead).
- No water can enter the air vents. Water ingress into the air vents may cause malfunction.
4. Operating Instructions
4.1. Power On/Off and Mist Control
Locate the mist/power button (often indicated by a mist icon or power symbol) on the front of the diffuser.
- First Press: Activates continuous mist and the flame effect. The diffuser will operate for 1 hour by default.
- Second Press: Sets the timer for 3 hours.
- Third Press: Sets the timer for 6 hours.
- Fourth Press: Turns off the diffuser.
- Long Press: To turn off the diffuser at any time, press and hold the mist/power button.
4.2. Light Modes (Flame Effect and Ambient Light)
Locate the light button (often indicated by a light bulb icon) on the front of the diffuser.
- Flame Effect: The flame effect typically activates automatically with the mist.
- Ambient Light Button (Bottom Light):
- Press in sequence to fix the color (yellow, red, blue, green).
- Long press to start the seven-color automatic color-changing light.

Figure 5: Colorful Simulation Flame Lighting
5. Maintenance and Care
Regular cleaning and proper care will extend the lifespan of your diffuser and ensure optimal performance.
5.1. Cleaning the Diffuser
- Unplug: Always unplug the diffuser from the power outlet before cleaning.
- Empty Water: Remove the top cover and carefully empty any remaining water from the water tank.
- Wipe Tank: Wipe the inside of the water tank with a soft, damp cloth.
- Clean Atomizing Chip: Gently clean the ultrasonic atomizing chip (the small metal disc at the bottom of the tank) with a cotton swab dipped in clean water. Do not scrub or use abrasive materials.
- Rinse: Rinse the tank with clean water and wipe dry.
- External Cleaning: Wipe the exterior of the diffuser with a soft, dry cloth.
Note: For stubborn residue, add a small amount of white vinegar to the water tank, let it sit for 10-15 minutes, then drain and rinse thoroughly.
5.2. Salt Crystal Care
- Periodically wipe the Himalayan crystal salt pieces with a dry cloth to remove any dust accumulation.
- Do not wash the salt crystals with water, as they are hygroscopic and will dissolve.
5.3. Storage
If the diffuser will not be used for an extended period:
- Ensure the unit is thoroughly cleaned and completely dry.
- Store it in a cool, dry place, away from direct sunlight and extreme temperatures.
6. Troubleshooting
If you encounter any issues with your diffuser, please refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No mist or weak mist | Low water level Ultrasonic chip dirty Air outlet blocked Top cover not properly seated | Refill water to the appropriate level Clean the ultrasonic atomizing chip Ensure air outlet is clear Re-seat the top cover securely |
| No light or light malfunction | Power connection issue Light function not activated | Check power adapter connection Press the light button to cycle through modes |
| Water leakage | Overfilling the water tank Diffuser not on a level surface Top cover not secure | Do not exceed the max water level line Place diffuser on a flat, stable surface Ensure the top cover is securely in place |
| Unit not turning on | No power Insufficient water (auto shut-off) | Check power cord connection and outlet Ensure water level is above the minimum required for operation |
7. Specifications
7.1. Technical Data
- Brand: Cotsoco
- Model Name: kp021
- Capacity: 250 Milliliters
- Power Source: Corded Electric
- Wattage: 12 Watts
- Material: Plastic
- Product Dimensions: 5L x 6.5W x 3H Centimeters
- Special Features: Automatic Shut-Off, Silent Operation, Flame Effect, Color-Changing LED, Himalayan Salt
- Coverage: Medium to Large Room
- Noise Level: Under 24dB
- Country of Origin: China
8. Warranty and Support
Warranty Information:
Warranty terms and conditions for the Cotsoco Aroma Diffuser (Model: kp021) are typically provided at the point of purchase or included with the product packaging. Please refer to your purchase receipt or contact the retailer from whom you purchased the product for specific warranty details, duration, and coverage.
Customer Support:
For technical assistance, troubleshooting guidance, or any other product-related inquiries, please contact Cotsoco customer service. You can usually find contact information through your retailer or by visiting the official Cotsoco brand website.

