1. Introduction
Thank you for choosing the MONODEAL S820 Swimming Headphones. These innovative bone conduction headphones are designed for active lifestyles, offering IP68 waterproof protection, 32GB of internal storage for MP3 playback, and Bluetooth 5.4 connectivity. Enjoy your music during swimming, running, cycling, and other sports activities while remaining aware of your surroundings.

Image: The MONODEAL S820 headphones, designed for aquatic environments, shown with water splashes and a swimmer.
2. Product Overview
2.1 Package Contents
The MONODEAL S820 package includes the following items:
- MONODEAL S820 Swimming Headphones
- Charging Cable (Magnetic)
- User Manual (this document)
- Ear Cushions (Earplugs for swimming)
- Protective Case
- Headband (Integrated)
2.2 Key Features
- IP68 Waterproof Rating: Designed for full submersion, ideal for swimming and water sports.
- Bone Conduction Technology: Delivers audio through your cheekbones, leaving your ears open to ambient sounds.
- 32GB Internal Storage: Store thousands of songs for MP3 playback, essential for underwater use where Bluetooth signals are limited.
- Bluetooth 5.4: Provides a fast and stable wireless connection for streaming audio.
- Ultra-lightweight Design: Weighing only 24g, ensuring comfortable wear for extended periods.
- 8-Hour Battery Life: Enjoy long listening sessions on a single charge.
- Flexible Silicone Material: Ensures a secure and comfortable fit for various head sizes.

Image: The MONODEAL S820 headphones highlighting their dual Bluetooth and MP3 modes for versatile music playback.
3. Setup
3.1 Charging the Headphones
Before first use, fully charge your headphones. Use the provided magnetic charging cable. Connect the magnetic end to the charging port on the headphones and the USB end to a standard USB power adapter (not included) or a computer's USB port.
- The charging indicator light will illuminate during charging.
- A full charge typically takes approximately 2 hours.
- Ensure the charging port is dry before connecting the cable to prevent damage.
Video: An official product video demonstrating the waterproof capabilities of the headphones, showing them in water and being used for swimming and surfing. This video also highlights the dual Bluetooth/MP3 mode, lightweight design, flexible silicone material, sound quality, Bluetooth 5.4, comfort, magnetic charging, and 8-hour battery life.
3.2 Bluetooth Pairing
To connect your headphones to a Bluetooth-enabled device (e.g., smartphone, tablet):
- Ensure the headphones are powered off.
- Press and hold the Power/Multi-function button for approximately 3 seconds until the indicator light flashes blue and red, indicating pairing mode.
- On your device, enable Bluetooth and search for available devices.
- Select "S820" from the list of devices.
- Once connected, the indicator light will flash blue slowly, and a voice prompt will confirm the connection.
3.3 Loading Music (MP3 Mode)
The headphones feature 32GB of internal storage for MP3 files, allowing you to listen to music underwater or without a Bluetooth connection.
- Connect the headphones to your computer using the provided magnetic charging cable.
- The headphones will appear as a removable disk drive on your computer.
- Drag and drop your desired MP3 audio files into the headphone's storage folder.
- Once files are transferred, safely eject the device from your computer before disconnecting the cable.

Image: A man swimming laps in a pool while wearing the MONODEAL S820 headphones, emphasizing their IP68 waterproof design for underwater use. Note: MP3 mode is required for underwater listening.
4. Operating Instructions
4.1 Basic Controls
| Button/Action | Function |
|---|---|
| Power/Multi-function Button (Press and hold 3s) | Power On/Off |
| Power/Multi-function Button (Single press) | Play/Pause music, Answer/End call |
| Power/Multi-function Button (Double press) | Switch between Bluetooth Mode and MP3 Mode |
| Volume + Button (Single press) | Increase Volume |
| Volume + Button (Long press) | Next Track |
| Volume - Button (Single press) | Decrease Volume |
| Volume - Button (Long press) | Previous Track |
4.2 Bluetooth Mode
In Bluetooth mode, the headphones stream audio wirelessly from your paired device. This mode is suitable for land-based activities like running, cycling, or daily use.
- Ensure your device's Bluetooth is enabled and the headphones are paired.
- Control playback and volume using the headphone buttons or your connected device.
- Bluetooth signal may be interrupted or lost underwater. Switch to MP3 mode for swimming.

Image: A man running while wearing the MONODEAL S820 headphones, indicating their use in Bluetooth mode for outdoor activities.
4.3 MP3 Mode
MP3 mode utilizes the internal 32GB storage, allowing for music playback without a Bluetooth connection. This is the recommended mode for swimming and other underwater activities.
- To switch to MP3 mode, double-press the Power/Multi-function button. A voice prompt will confirm the mode change.
- Ensure you have loaded MP3 files onto the headphones as described in Section 3.3.
- Use the Volume + and Volume - buttons for track navigation (long press) and volume adjustment (single press).

Image: A woman in water wearing the MONODEAL S820 headphones, illustrating their use in MP3 mode for aquatic environments.
5. Maintenance
Proper care will extend the life of your MONODEAL S820 headphones.
- Cleaning: After use, especially after swimming, rinse the headphones with clean fresh water. Wipe them dry with a soft cloth. Do not use harsh chemicals or abrasive cleaners.
- Drying the Charging Port: Ensure the magnetic charging port is completely dry before charging to prevent corrosion.
- Storage: Store the headphones in their protective case in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: For optimal battery life, avoid fully discharging the battery frequently. Charge regularly, even if not used for extended periods.
6. Troubleshooting
If you encounter issues with your headphones, refer to the following common solutions:
| Problem | Possible Solution |
|---|---|
| Headphones do not power on. | Ensure the battery is charged. Connect to the charger and try again. |
| Cannot pair via Bluetooth. |
|
| No sound in Bluetooth mode. |
|
| No sound in MP3 mode. |
|
| Sound quality is poor underwater. | Ensure you are in MP3 mode. Bluetooth does not transmit well underwater. Using the included earplugs can also improve sound clarity underwater. |
| Headphones not recognized by computer. | Try a different USB port or cable. Ensure the cable is fully inserted and the magnetic connection is secure. Restart your computer. |
7. Specifications
| Feature | Detail |
|---|---|
| Model Name | S820 |
| Brand | MONODEAL |
| Form Factor | Bone Conduction |
| Ear Placement | Open Ear |
| Water Resistance Level | IP68 |
| Bluetooth Version | 5.4 |
| Internal Storage | 32GB (MP3 Mode) |
| Battery Life | Up to 8 Hours |
| Charging Time | Approx. 2 Hours |
| Item Weight | 24g (0.85 ounces) |
| Material | Silicone |
| Recommended Uses | Cycling, Running, Swimming, Fitness |
8. Warranty and Support
MONODEAL products are designed for durability and performance. For any warranty claims, technical support, or inquiries, please contact the seller or manufacturer directly through your purchase platform. Please refer to your purchase receipt or order details for specific warranty terms and contact information.
Manufacturer: MONODEAL





