Introduction
Thank you for purchasing the Simpeak 400ml Ultrasonic Essential Oil Diffuser. This device combines aromatherapy diffusion with a humidifier function, featuring a remote control and color-changing LED lighting. Please read this manual carefully before use to ensure proper operation and maintenance.

Image Description: A visual overview of the Simpeak diffuser's key features, including remote control, ultrasonic technology for mist, options for changing mist volume, timer settings, and automatic shut-off for safety.
Safety Precautions
- Always place the diffuser on a flat, stable surface.
- Do not fill water beyond the maximum fill line.
- Use only clean tap water or distilled water.
- Add only 100% pure essential oils. Avoid corrosive liquids or chemicals.
- Keep out of reach of children and pets.
- Unplug the diffuser from the power outlet before cleaning or when not in use.
- Do not touch the ultrasonic vibrating plate directly.
- Do not block the mist outlet.
- If the diffuser emits an unusual smell or sound, or if smoke appears, unplug it immediately.
- This product is BPA-free and safe for use around children and pregnant women.
Package Contents
Please check the package for the following items:
- Simpeak 400ml Essential Oil Diffuser (White Wood)
- Power Adapter
- Remote Control (with CR2025 battery included)
- Measuring Cup
- User Manual

Image Description: A photograph showing the Simpeak 400ml Essential Oil Diffuser, its power adapter, remote control, a small measuring cup, and the user manual, all neatly arranged next to the product packaging box.
Product Diagram
Familiarize yourself with the components of your diffuser:

Image Description: A photograph of the Simpeak 400ml Essential Oil Diffuser in white wood finish, emitting mist, with its remote control placed in front. The diffuser features a decorative outer shell, an inner water tank, and control buttons for mist and light functions.
- Top Cover: Removable cover for accessing the water tank.
- Mist Outlet: Where the aromatherapy mist is released.
- Water Tank: Holds water and essential oils (400ml capacity).
- Max Water Line: Indicates the maximum water level.
- Ultrasonic Vibrating Plate: Located at the bottom of the water tank, responsible for mist generation.
- Air Outlet: Located on the base.
- Drain Side: For emptying water.
- Power Socket: For connecting the power adapter.
- Control Buttons: Located on the front base for Mist, Light, and Timer functions.
- Remote Control: For convenient operation from a distance.
Setup
Follow these steps to set up your diffuser:
- Lift the Cover: Gently remove the top cover of the diffuser.
- Connect Power: Insert the power cable into the power socket at the bottom of the diffuser. Then, plug the adapter into a wall outlet.
- Add Water: Using the provided measuring cup, fill the water tank with clean water up to the maximum fill line (400ml). Do not exceed this line.
- Add Essential Oil: Add 2-3 drops of your preferred 100% pure essential oil directly into the water tank. Adjust the amount based on personal preference and room size.
- Replace Cover: Place the top cover back onto the diffuser, ensuring it is securely seated.

Image Description: A four-panel image illustrating the setup process. Panel 1 shows lifting the diffuser's top cover. Panel 2 shows inserting the power cable into the base. Panel 3 shows adding water and essential oil to the tank. Panel 4 shows pressing a button to start the diffuser.
Operating Instructions
The diffuser can be operated using the buttons on the unit or the remote control.
Mist Control
- Power On/Off: Press the "ON/OFF" button on the remote or the "Mist" button on the diffuser to turn the mist on or off.
- Mist Mode: Press the "Intermittent" button on the remote or cycle through mist modes using the "Mist" button on the diffuser.
- Continuous Mist: The diffuser will operate continuously until the water runs out.
- Intermittent Mist: The diffuser will mist for 30 seconds and pause for 30 seconds.
- Mist Volume: Press the "Big/Small" button on the remote or the "Mist" button on the diffuser to switch between high and low mist output.
Light Control
- Turn Light On/Off: Press the "Light" button on the remote or the diffuser to turn the LED light on or off.
- Color Cycle Mode: When the light is on, it will automatically cycle through 7 different colors.
- Fixed Color Mode: Press the "Light" button repeatedly to cycle through the available colors and select your desired fixed color.
- Brightness Adjustment: Press and hold the "Light" button on the diffuser to adjust the brightness of the current color (bright/dim).

Image Description: The Simpeak diffuser shown with various LED light colors, illustrating its 7 color options. Text overlays indicate a low noise level of less than 34dB and a maximum water capacity of 400ml, contributing to a quiet and comfortable atmosphere.
Timer Settings
Set the diffuser to operate for a specific duration:
- Press the "Timing" button on the remote or the "Timer" button on the diffuser to select a timer setting.
- Available timer options are: 1 Hour, 3 Hours, 6 Hours, or ON (continuous operation).
- The diffuser will automatically shut off once the selected time has elapsed or when the water level is too low.
Remote Control Usage
The remote control allows for convenient operation from up to 3 meters away. It is powered by a CR2025 3V button battery (included).

Image Description: A close-up view of the remote control for the Simpeak diffuser, showing its various buttons: ON/OFF, Intermittent mist, Continuous mist, Timing (1H, 3H, 6H, ON), Big/Small mist, and Light control. The diffuser is visible in the background, emitting mist with a red LED light.
Maintenance
Regular cleaning helps maintain optimal performance and extends the lifespan of your diffuser.
- Unplug: Always unplug the diffuser from the power source before cleaning.
- Empty Water: Remove the top cover and carefully pour out any remaining water from the "Drain Side" of the water tank.
- Clean Water 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 vibrating plate.
- Rinse: Rinse the water tank with clean water, being careful not to get water into the air outlet.
- Dry: Allow all parts to air dry completely before reassembling or storing.
- Frequency: Clean the diffuser after every 5-6 uses or every 3-5 days, especially when changing essential oils.
Important: Do not immerse the diffuser base in water. Do not use harsh detergents or abrasive cleaners.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No mist or low mist output. |
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| Diffuser does not turn on. |
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| Light function not working. |
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| Remote control not working. |
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Specifications
| Brand | Simpeak |
| Model Number | YX-137 |
| Color | White Wood |
| Dimensions (L x W x H) | 14.5 x 14.5 x 16.5 cm |
| Item Weight | 820 g |
| Water Tank Capacity | 400 Milliliters |
| Material | Acrylonitrile Butadiene Styrene (ABS), Polypropylene (PP) |
| Power Consumption | Approximately 10W |
| Operating Time | Up to 10 hours (continuous mist) |
| Coverage Area | 20-40 m² |
| Noise Level | Less than 34 dB |
| Automatic Shut-off | Yes, when water runs out |
| Light Source Type | LED (7 colors) |
| Remote Control Range | 3 meters |
Warranty and Support
For warranty information or technical support, please refer to the contact details provided with your purchase or visit the official Simpeak website. Keep your purchase receipt as proof of purchase.