Introduction
Thank you for choosing the coioc S25 Bluetooth 5.3 Wireless Earbuds. These earbuds are designed to provide a high-quality audio experience with powerful deep bass, a comfortable ergonomic fit, and advanced features like Bluetooth 5.3 connectivity, an LED power display, and IPX7 waterproofing. This manual will guide you through the setup, operation, and maintenance of your new earbuds to ensure optimal performance and longevity.

Image: The coioc S25 charging case with a lanyard, shown attached to a backpack, illustrating its portable design for easy carrying.
Package Contents
Please check the package for the following items:
- coioc S25 Wireless Earbuds (Left and Right)
- Charging Case
- USB-C Charging Cable
- Silicone Eartips (Small, Medium, Large)
- User Manual
Setup
1. Initial Charging
Before first use, fully charge the earbuds and the charging case. Connect the provided USB-C cable to the charging port on the case and to a power source. The LED power display on the case will indicate the charging status.

Image: The charging case with an LED display showing battery levels for both the case and the individual earbuds.
The LED display shows the charging percentage of the case and individual battery bars for each earbud. A full charge provides up to 6 hours of listening time for the earbuds, with the charging case offering an additional 5 charges for a total of up to 35 hours of playtime.

Image: The coioc S25 earbuds and charging case, illustrating playtime. The image indicates up to 6 hours for a single earbud charge and up to 40 hours total with the charging case. Please note that product specifications state up to 35 hours total playtime.
2. Wearing the Earbuds
Select the silicone eartips that provide the most comfortable and secure fit for your ears. A proper fit is crucial for optimal sound quality and noise isolation.
- Choose the eartip size (S/M/L) that best seals your ear canal.
- Insert the earbuds into your ears and gently rotate them until they feel secure and comfortable.

Image: A person wearing the coioc S25 earbuds, highlighting their ergonomic design and the soft silicone eartips for a secure and comfortable fit.
3. Pairing with Your Device
The coioc S25 earbuds feature Bluetooth 5.3 for a stable and fast connection.
- Open the charging case and remove both earbuds. They will automatically power on and enter pairing mode.
- On your device (smartphone, tablet, computer), go to the Bluetooth settings.
- Search for available devices and select "coioc S25" from the list.
- Once connected, you will hear a confirmation tone, and the earbuds will be ready for use.
The earbuds will automatically reconnect to the last paired device when removed from the case, provided Bluetooth is enabled on your device.
Operating Instructions
Power On/Off
- Power On: Remove the earbuds from the charging case. They will power on automatically.
- Power Off: Place the earbuds back into the charging case. They will power off automatically and begin charging.
Touch Controls
The coioc S25 earbuds feature intuitive touch controls on each earbud. The specific functions may vary slightly depending on your device and application.
| Action | Function |
|---|---|
| Single Tap (Left/Right) | Play/Pause Music, Answer/End Call |
| Double Tap (Right Earbud) | Next Track |
| Double Tap (Left Earbud) | Previous Track |
| Triple Tap (Left/Right) | Activate Voice Assistant |
| Long Press (Left/Right) | Reject Call |
Sound Quality
The earbuds feature 13mm large drivers with a high-quality PU composite diaphragm, delivering powerful bass and clear treble for a rich stereo sound experience.

Image: An exploded view diagram illustrating the 13mm large driver responsible for deep bass in the coioc S25 earbuds.
Maintenance
- Cleaning: Regularly clean the earbuds, especially the eartips and charging contacts, with a dry, soft, lint-free cloth. Do not use harsh chemicals or abrasive materials.
- Water Resistance: The earbuds are IPX7 waterproof, meaning they are protected against immersion in water up to 1 meter for 30 minutes. They are suitable for sports and workouts where sweat or light rain may occur. However, they are not designed for swimming or prolonged submersion. Ensure the earbuds are dry before placing them back in the charging case.
- Storage: Store the earbuds in their charging case when not in use to protect them and keep them charged.
- Temperature: Avoid exposing the earbuds to extreme temperatures (hot or cold) or high humidity.
Troubleshooting
If you encounter any issues with your coioc S25 earbuds, please refer to the following common solutions:
| Problem | Possible Solution |
|---|---|
| Earbuds not pairing/connecting |
|
| No sound or low volume |
|
| Charging issues |
|
Specifications
| Feature | Detail |
|---|---|
| Model Number | S25 |
| Bluetooth Version | 5.3 |
| Earbud Playtime | Up to 6 hours (single charge) |
| Total Playtime (with case) | Up to 35 hours |
| Water Resistance Rating | IPX7 |
| Driver Size | 13mm |
| Frequency Range | 20 Hz - 20,000 Hz |
| Control Type | Touch Control |
| Earbud Form Factor | In-Ear |
| Weight | 43 Grams (total) |
| Charging Port | USB-C |
Warranty and Support
Specific warranty information for the coioc S25 earbuds is not provided in the product details. For warranty claims, technical support, or any other inquiries, please refer to the contact information provided with your purchase or visit the official coioc website.