EarFun TW100
EarFun Free 1S Wireless Earbuds User Manual
Model: TW100
1. Introduction
Thank you for choosing EarFun Free 1S Wireless Earbuds. This manual provides detailed instructions on how to set up, operate, and maintain your earbuds to ensure optimal performance and longevity. Please read this manual thoroughly before use.
2. What's in the Box
- EarFun Free 1S Wireless Earbuds
- USB-C charging cable
- 3 sizes silicone ear tips (S, M, L)
- User Manual
3. Product Overview

Image: EarFun Free 1S Wireless Earbuds with their charging case, showcasing their compact design.
The EarFun Free 1S earbuds are designed for comfort and high-quality audio. Each earbud features a touch-sensitive surface for controls and an LED indicator. The charging case protects the earbuds and provides additional battery life.
4. Setup
4.1 Charging
Before first use, fully charge both the earbuds and the charging case. Place the earbuds into the charging case, ensuring the charging contacts align. Close the lid. Connect the USB-C cable to the charging case and a power source, or place the case on a wireless charging pad.

Image: Visual representation of 30 hours total playtime, 6 hours single playtime, and 1.5 hours quick charge time for the EarFun Free 1S.

Image: Diagram highlighting the importance of clean charging contacts on both the earbuds and inside the charging case for proper charging.
4.2 Pairing with Your Device
- Open the charging case. The earbuds will automatically enter pairing mode, indicated by a flashing blue light on the earbuds.
- On your device (smartphone, tablet, etc.), enable Bluetooth.
- Search for "EarFun Free 1S" in the list of available Bluetooth devices.
- Select "EarFun Free 1S" to connect. Once connected, the LED indicator on the earbuds will turn off.
If pairing fails, place the earbuds back into the case, close the lid, and try again. For a new device, disconnect from the current device first.
4.3 Wearing the Earbuds
Choose the ear tips that provide the best seal and comfort for your ears. Insert the earbuds into your ear canal and gently twist them to secure a snug fit. A proper fit is crucial for optimal sound quality and noise isolation.
5. Operating Instructions
5.1 Basic Controls
The EarFun Free 1S earbuds feature intuitive touch controls. The specific functions can often be customized via the EarFun Audio App.
| Action | Function |
|---|---|
| Single Tap (L/R) | Play/Pause, Answer/End Call |
| Double Tap (L) | Volume Down |
| Double Tap (R) | Volume Up |
| Triple Tap (L) | Previous Track |
| Triple Tap (R) | Next Track |
| Long Press (L/R, 2s) | Activate Voice Assistant, Reject Call |
5.2 EarFun Audio App
Enhance your experience by downloading the EarFun Audio App. The app allows for personalized settings and features, including:
- Multi-EQ adjustment for customized sound profiles.
- Customizable touch controls.
- Battery level display for each earbud and the case.
- Firmware updates.
- Game Mode activation for lower latency.

Image: Screenshots of the EarFun Audio App interface, demonstrating options for personalized EQ settings and customizable touch controls.
5.3 Single Earbud Mode
You can use either the left or right earbud independently for calls or music. Simply take one earbud out of the case, and it will automatically connect to your device if already paired. The other earbud can remain in the case or be used later.

Image: A smartphone displaying a music player interface with one EarFun Free 1S earbud placed on the screen, illustrating the single earbud mode functionality.
5.4 Call Functions
The EarFun Free 1S features 4 built-in microphones with Environmental Noise Cancellation (ENC) technology, ensuring clear calls by minimizing background noise and focusing on your voice.

Image: A man smiling while using the EarFun Free 1S earbuds, with a graphic illustrating how the 4-mic system separates voice from noise for clear calls.
5.5 Game Mode
For an optimized gaming experience, activate Game Mode via the EarFun Audio App. This mode reduces audio latency, providing a more synchronized sound with on-screen action.
6. Maintenance
6.1 Cleaning
Regular cleaning helps maintain sound quality and charging efficiency. Use a soft, dry, lint-free cloth to wipe the earbuds and charging case. Gently clean the charging contacts on both the earbuds and inside the case with a dry cotton swab. Do not use harsh chemicals or abrasive materials.
6.2 Water Resistance
The EarFun Free 1S earbuds are IPX7 waterproof, meaning they can withstand immersion in up to 1 meter of water for 30 minutes. This makes them suitable for workouts and use in light rain. However, the charging case is not waterproof. Ensure earbuds are completely dry before placing them back into the charging case to prevent damage.

Image: EarFun Free 1S earbuds partially submerged in water, with an IPX7 rating icon, illustrating their Sweatshield™ waterproof technology.
7. Troubleshooting
If you encounter issues with your EarFun Free 1S earbuds, try the following solutions:
- No Sound: Ensure earbuds are charged, connected to your device, and volume is turned up. Check if the correct audio output is selected on your device.
- Pairing Issues: Turn off Bluetooth on other nearby devices. Place earbuds back in the case, close, then reopen to re-enter pairing mode. Try forgetting the device on your phone and re-pairing.
- One Earbud Not Working: Ensure both earbuds are charged. Try resetting the earbuds (refer to the full user manual PDF for specific reset instructions).
- Charging Issues: Clean the charging contacts on both earbuds and inside the case. Ensure the USB-C cable is securely connected or the wireless charging pad is properly aligned.
- Poor Sound Quality: Ensure ear tips provide a good seal. Clean any debris from the earbud nozzles.
For more detailed troubleshooting, please refer to the official EarFun support resources.
8. Specifications
| Feature | Detail |
|---|---|
| Model Name | EarFun Free 1S |
| Item Model Number | TW100 |
| Connectivity Technology | Wireless (Bluetooth) |
| Bluetooth Version | Bluetooth 5.0 (implied by product age/type) |
| Audio Driver Type | 7mm Composite Dynamic Driver |
| Microphones | 4 Mics with ENC Tech for Clear Call |
| Water Resistance Level | IPX7 (Sweatshield™ Waterproof) |
| Playtime (Single Charge) | Up to 6 hours |
| Total Playtime (with Case) | Up to 30 hours |
| Charging Time | 1.5 hours (earbuds & case) |
| Charging Port | USB-C |
| Wireless Charging | Supported |
| Frequency Response | 20 Hz - 20,000 Hz |
| Item Weight | 52 Grams (total) / 1.83 ounces |
| Dimensions | 3.15 x 1.38 x 1.18 inches |
9. Warranty and Support
EarFun products come with a standard warranty. For detailed warranty information, product registration, or technical support, please visit the official EarFun website or contact their customer service.
You can also refer to the official User Manual PDF for more comprehensive details: Download User Manual (PDF)
For additional support and product information, visit the EarFun Store: EarFun Official Store
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