Introduction
This manual provides detailed instructions for the Fonus TWS Wireless Earbuds, model Fo-FO21865F0J-95. Please read this guide thoroughly before using your earbuds to ensure proper operation and to maximize your listening experience. Keep this manual for future reference.
Package Contents
- Fonus TWS Wireless Earbuds (Left and Right)
- Portable Charging Case
- USB Charging Cable
- Multiple Sizes of Silicone Ear Tips
- User Manual
Product Overview
The Fonus TWS Wireless Earbuds are designed for a true wireless audio experience, offering stereo sound and hands-free calling. The compact charging case provides extended battery life and protects the earbuds when not in use.

Image: Fonus TWS Wireless Earbuds placed inside their charging case. The case features a digital display indicating the battery percentage and charging status of both earbuds.
Each earbud features an 8mm speaker driver for clear audio and a built-in microphone for calls. The charging case includes a digital display to show the battery level.

Image: Cross-section diagram illustrating the internal components of an earbud, highlighting the 8mm sound speaker designed for immersive audio.
Setup
1. Charging the Earbuds and Case
Before first use, fully charge the earbuds and the charging case. Place the earbuds into the charging case. Connect the USB charging cable to the charging port on the case and to a power source. The digital display on the case will show the charging status.

Image: Infographic detailing the battery life: 5 hours talk time, 7 hours listening time, 120 hours total playtime with charging case, and 10 minutes charge for 1 hour playtime. It also shows the earbuds charging inside the 3500 mAh case.
- Earbud Charging: Place earbuds into the charging case. They will automatically begin charging.
- Case Charging: Connect the charging case to a USB power adapter. The digital display indicates the case's battery level.
- A full charge provides approximately 7 hours of listening time, with the charging case offering an additional 113 hours for a total of 120 hours.
2. Pairing with Your Device
The earbuds use Bluetooth 5.0 for stable connectivity.

Image: Diagram illustrating the Bluetooth 5.0 chip within an earbud, emphasizing faster transmission speed and stable connectivity up to 98 feet.
- Power On: Open the charging case, and the earbuds will automatically power on and enter pairing mode.
- Activate Bluetooth: On your device (e.g., smartphone, tablet), go to the Bluetooth settings and enable Bluetooth.
- Select Device: Look for "Fonus Earbuds" or a similar name in the list of available devices and select it to connect.
- Confirmation: Once connected, you will hear an audio prompt, and the indicator light on the earbuds may change.
The earbuds will automatically reconnect to the last paired device when taken out of the case, if Bluetooth is enabled on the device.
Operating Instructions
The earbuds feature intelligent touch controls for various functions.

Image: A visual guide demonstrating the intelligent touch controls on the earbuds, showing actions for play/pause, skipping tracks, answering calls, volume adjustment, and activating voice assistants.
- Play/Pause: Press once on either the Left (L) or Right (R) earbud.
- Skip Backwards: Press twice on the Left (L) earbud.
- Skip Forwards: Press twice on the Right (R) earbud.
- Answer/Hang Up Call: Press once on either the Left (L) or Right (R) earbud.
- Volume Down: Long press on the Left (L) earbud.
- Volume Up: Long press on the Right (R) earbud.
- Activate Voice Assistant (Siri, Google Assistant): Press thrice on either the Left (L) or Right (R) earbud.
Maintenance
- Cleaning: Regularly clean the earbuds and charging case with a soft, dry, lint-free cloth. Do not use harsh chemicals or abrasive materials.
- Ear Tips: Remove and clean the silicone ear tips with water if necessary. Ensure they are completely dry before reattaching.
- Storage: When not in use, store the earbuds in their charging case to protect them from dust and damage. Store in a cool, dry place.
- Water Resistance: The earbuds are IPX8 sweat/water-resistant. This protects against splashes and sweat but they are not designed for submersion. Avoid exposing them to excessive moisture.
Troubleshooting
- No Sound:
- Ensure earbuds are charged.
- Check if the earbuds are properly paired with your device.
- Adjust the volume on both your device and the earbuds.
- Try re-pairing the earbuds.
- Earbuds Not Pairing:
- Ensure Bluetooth is enabled on your device.
- Make sure the earbuds are out of the charging case and in pairing mode.
- Turn off Bluetooth on other nearby devices to avoid interference.
- Try resetting the earbuds (refer to specific reset instructions if available, otherwise place back in case and remove).
- Charging Issues:
- Verify the charging cable is securely connected to both the case and the power source.
- Ensure the charging contacts on the earbuds and inside the case are clean and free of debris.
- Try a different charging cable or power adapter.
- Intermittent Connection:
- Ensure your device is within the effective Bluetooth range (approximately 30 feet or 10 meters).
- Avoid physical obstructions between your device and the earbuds.
- Minimize interference from other wireless devices.
Specifications
| Model Number | Fo-FO21865F0J-95 |
| Brand | Fonus |
| Connectivity | Bluetooth 5.0 |
| Ear Placement | In Ear |
| Form Factor | In Ear |
| Noise Control | Passive Noise Cancellation |
| Playtime (Single Charge) | Up to 7 hours |
| Total Playtime (with Case) | Up to 120 hours |
| Water Resistance | IPX8 (Sweat/Water-Resistant) |
| Item Weight | 4 ounces |
| UPC | 701052218657 |
Warranty Information
Fonus products are typically covered by a limited manufacturer's warranty. Please refer to the warranty card included in your product packaging or visit the official Fonus website for specific warranty terms and conditions, including duration and coverage details. Keep your proof of purchase for warranty claims.
Customer Support
If you encounter any issues or have questions not covered in this manual, please contact Fonus customer support. You can usually find contact information (email, phone, or support portal) on the official Fonus website or through the retailer where you purchased the product.
When contacting support, please have your product model number (Fo-FO21865F0J-95) and proof of purchase ready.





