1. Introduction
Thank you for choosing the PSIER S18 Bone Conduction Swimming Headphones. These headphones are designed to provide a high-quality audio experience for various activities, including swimming, running, and cycling. Featuring IPX8 waterproofing, dual Bluetooth 5.4 and MP3 modes with 32GB of internal memory, and an open-ear design, the S18 ensures comfort, safety, and versatility.
This manual provides detailed instructions on how to set up, operate, and maintain your headphones to ensure optimal performance and longevity.

Image: PSIER S18 Bone Conduction Headphones submerged in water, highlighting their waterproof capability.
2. Package Contents
Please check the package for the following items:
- PSIER S18 Bone Conduction Headphones
- Magnetic Charging Cable
- Swimming Earplugs
- Adjustable Strap
- User Manual

Image: The package contents including the headphones, charging cable, earplugs, and user manual.
3. Product Overview
Familiarize yourself with the main components and controls of your PSIER S18 headphones.

Image: A detailed view of the headphone's control buttons and magnetic charging port.
- Power/Mode Button: Used for powering on/off and switching between Bluetooth and MP3 modes.
- Volume Up/Next Track Button: Increases volume with a short press, skips to the next track with a long press.
- Volume Down/Previous Track Button: Decreases volume with a short press, goes to the previous track with a long press.
- Magnetic Charging Port: For charging the device and connecting to a computer for data transfer.
- Microphone: For hands-free calling.
4. Setup
4.1 Charging the Headphones
Before first use, fully charge your headphones. A full charge takes approximately 2 hours and provides up to 8 hours of playtime.
- Connect the magnetic charging cable to the charging port on the headphones.
- Connect the other end of the cable to a USB power adapter (not included) or a computer's USB port.
- The indicator light will show charging status (refer to the LED indicator section for details).

Image: The magnetic charging cable attaching to the headphone's charging port.
4.2 Loading Music (MP3 Mode)
The headphones feature 32GB of built-in memory, capable of storing up to 4,000 songs. They support MP3, WMA, WAV, APE, and FLAC formats.
- Connect the magnetic charging cable to the headphones and then to your computer's USB port.
- Your computer will recognize the headphones as a removable disk.
- Drag and drop your desired audio files into the headphone's storage folder.
- Safely eject the device from your computer once file transfer is complete.
Note: Two sample music pieces are pre-stored in the memory from the factory.

Image: Visual representation of the 32GB MP3 storage, capable of holding up to 4,000 songs.
5. Operating Instructions
5.1 Power On/Off
- Power On: Press and hold the Power/Mode button for 3 seconds.
- Power Off: Press and hold the Power/Mode button for 5 seconds.
5.2 Mode Switching (Bluetooth / MP3)
The headphones support both Bluetooth and MP3 modes.
- To switch between Bluetooth and MP3 modes, double-click the Power/Mode button.
- Note: When using the headphones underwater, always switch to MP3 mode as Bluetooth signals do not transmit effectively through water.
5.3 Music Playback Control
- Play/Pause: Click the Power/Mode button once.
- Volume Up: Click the Volume Up button once.
- Volume Down: Click the Volume Down button once.
- Next Track: Press and hold the Volume Up button for 2 seconds.
- Previous Track: Press and hold the Volume Down button for 2 seconds.
5.4 Call Management
- Answer Call: Click the Power/Mode button once.
- End Call: Click the Power/Mode button once during a call.
- Reject Call: Press and hold the Power/Mode button for 2 seconds.

Image: A visual guide to the headphone's buttons and their corresponding functions for power, music, and calls.
6. Wearing Instructions
For optimal sound quality and comfort, ensure the headphones are worn correctly.
- Gently pull the headphones open with your hands to create enough space to fit over your head.
- Position the ear hooks over your ears, ensuring the transducers rest comfortably on your cheekbones, just in front of your ears.
- Adjust the frame size using the adjustable strap at the back of your head for a stable and secure fit.

Image: Step-by-step visual instructions for correctly wearing the bone conduction headphones.
7. Water Usage
The PSIER S18 headphones are IPX8 waterproof, meaning they can be submerged in water up to two meters deep for one hour. They are suitable for swimming, snorkeling, fishing, and boating.
- Important: Always switch to MP3 Mode when using the headphones underwater. Bluetooth signals cannot maintain a stable connection in water.
- Use the provided swimming earplugs to enhance sound clarity and protect your ears during water activities.

Image: The PSIER S18 headphones shown partially submerged in water, demonstrating their waterproof design.

Image: A swimmer wearing the PSIER S18 headphones while swimming, illustrating their use in aquatic environments.
8. Maintenance
8.1 Cleaning
- After each use, especially after swimming, rinse the headphones with fresh water.
- Wipe the headphones dry with a soft, clean cloth. Ensure the charging port is completely dry before charging.
- Do not use abrasive cleaners or harsh chemicals.
8.2 Storage
- Store the headphones in a cool, dry place away from direct sunlight and extreme temperatures.
- Avoid placing heavy objects on the headphones.
9. Troubleshooting
If you encounter any issues with your PSIER S18 headphones, please refer to the following common problems and solutions:
| Problem | Possible Solution |
|---|---|
| Headphones do not power on. | Ensure the headphones are fully charged. Press and hold the Power/Mode button for 3 seconds. |
| No sound or low volume. | Increase the volume on the headphones and your connected device. Ensure the headphones are correctly positioned on your cheekbones. Check if the correct mode (Bluetooth or MP3) is selected. |
| Bluetooth connection issues. | Ensure Bluetooth is enabled on your device and the headphones are in Bluetooth pairing mode. Move closer to your device. Disconnect and re-pair the headphones. |
| Cannot transfer music files. | Ensure the magnetic charging cable is securely connected to both the headphones and the computer. Try a different USB port or cable. Ensure the headphones are recognized as a removable disk. |
| Sound quality is poor in MP3 mode underwater. | Ensure earplugs are properly inserted to improve sound clarity underwater. |
| Cannot skip songs in MP3 mode. | Ensure you are using the correct long-press action on the Volume Up/Down buttons to skip tracks. |
10. Specifications
| Feature | Detail |
|---|---|
| Model Name | S18 |
| Connectivity Technology | Wireless (Bluetooth) |
| Wireless Communication | Bluetooth 5.4 |
| Waterproof Rating | IPX8 (Submersible up to 2 meters for 1 hour) |
| Internal Memory | 32GB (stores up to 4,000 songs) |
| Supported Audio Formats | MP3, WMA, WAV, APE, FLAC |
| Playtime | Up to 8 hours |
| Charging Time | Approximately 2 hours |
| Ear Placement | On Ear (Bone Conduction) |
| Item Weight | 5 ounces |
| Manufacturer | PSIER |
11. Warranty and Support
For warranty information or technical support, please refer to the contact details provided with your purchase or visit the official PSIER website. Keep your proof of purchase for any warranty claims.





