EarFun
EarFun OpenJump Open Ear Headphones Instruction Manual
Model: OW100B
Product Overview
The EarFun OpenJump Open Ear Headphones are wireless earbuds designed for comfort and awareness, featuring an ergonomic earhook design. They deliver Hi-Res audio with LDAC support, clear calls with 4 AI-enhanced microphones, and offer extended playtime. These headphones are IPX7 waterproof, making them suitable for various activities including workouts and running. They also support multipoint connection for seamless device switching.

Image: EarFun OpenJump headphones with their charging case.
What's in the Box
Upon unboxing your EarFun OpenJump headphones, you will find the following components:
- EarFun OpenJump Headphones (Left and Right)
- Charging Case
- USB-C Charging Cable
- User Manual (this document)
Video: An unboxing demonstration of the EarFun OpenJump Open Ear Headphones, showing all included components.
Setup and First Use
1. Charging the Headphones
Before first use, ensure the charging case and headphones are fully charged. Place the earbuds into the charging case. Connect the USB-C cable to the charging case and a power source. The indicator light on the case will show charging status.

Image: EarFun OpenJump headphones inside their charging case, illustrating the charging process and battery indicators.
2. Wearing the Headphones
The EarFun OpenJump headphones feature an ergonomic open-ear design with adjustable ear hooks for a secure and comfortable fit. To wear them:
- Take out the earbuds from the case.
- Place the earbud over your ear, ensuring the earhook wraps around the back of your ear.
- Adjust the earhook and earbud until it sits snugly and comfortably, with the speaker positioned near your ear canal without entering it.

Image: A person wearing the EarFun OpenJump headphones, highlighting the comfortable and secure open-ear fit.
Video: A demonstration on how to properly wear the EarFun OpenJump headphones for optimal comfort and sound.
3. Pairing with Your Device (Bluetooth 5.3)
The EarFun OpenJump headphones utilize Bluetooth 5.3 for a stable and fast connection. They also support Google Fast Pair for Android devices.
- Open the charging case. The earbuds will automatically enter pairing mode (indicator lights will flash).
- On your device (smartphone, tablet, laptop), enable Bluetooth and search for "EarFun OpenJump" in the list of available devices.
- Select "EarFun OpenJump" to connect. Once connected, the indicator lights will stop flashing.
- For Android devices, if Google Fast Pair is enabled, a pop-up notification will appear for quick pairing.
Multipoint Connection: These headphones can connect to two Bluetooth devices simultaneously. After connecting to the first device, connect to the second device. The headphones will intelligently switch between devices based on audio playback.
Operating Instructions
Touch Controls
The EarFun OpenJump headphones feature intuitive touch controls on each earbud. The default functions are as follows:
| Action | Left Earbud (L) | Right Earbud (R) |
|---|---|---|
| Play/Pause | Tap x2 | Tap x2 |
| Answer/End Call | Tap x2 | Tap x2 |
| Reject Call | Press and hold for 2s | Press and hold for 2s |
| Voice Assistant | Press and hold for 2s | Press and hold for 2s |
| Volume Down | Tap x1 | N/A |
| Volume Up | N/A | Tap x1 |
| Previous Track | Tap x3 | N/A |
| Next Track | N/A | Tap x3 |
Note: These controls can be customized via the EarFun App.
Audio Features
- Hi-Res Sound with LDAC: Enjoy high-fidelity audio with rich details, powered by 14.2mm wool composite drivers and LDAC codec support.
- EarFun BassSurge Technology: Delivers enhanced bass for a more immersive listening experience.
- Open-Ear Design for Awareness: Allows you to hear your music while remaining aware of your surroundings, enhancing safety in outdoor environments.

Image: Detailed diagram illustrating the 14.2mm wool composite driver and BassSurge technology for high-resolution audio.
Call Functionality
The EarFun OpenJump headphones are equipped with 4 beamforming microphones and advanced AI algorithms for crystal-clear calls, effectively minimizing background noise.

Image: A man engaged in a clear call using the EarFun OpenJump headphones, demonstrating the microphone technology.
EarFun App Customization
Enhance your experience by downloading the EarFun App, available on Google Play and the App Store. The app allows you to:
- Personalize EQ settings.
- Customize touch controls.
- Activate Theater Mode for 3D surround sound.
- Update firmware for optimal performance.
- Use the "Find Headphones" feature.

Image: Screenshots of the EarFun mobile application, showcasing options for EQ, control customization, and other features.
Maintenance and Care
- Cleaning: Regularly wipe the earbuds and charging case with a soft, dry, lint-free cloth. Avoid using harsh chemicals or abrasive materials.
- Water Resistance (IPX7): The headphones are IPX7 waterproof, meaning they can withstand sweat, rain, and splashes. However, they are not designed for swimming or prolonged submersion. Ensure they are dry before placing them back in the charging case to prevent damage.
- Storage: Store the headphones in their charging case when not in use to protect them and keep them charged. Avoid extreme temperatures.
- Battery Life: To maximize battery longevity, avoid fully discharging the battery frequently. Charge them regularly.

Image: A person running, illustrating the IPX7 waterproof rating of the EarFun OpenJump headphones, suitable for outdoor activities.
Troubleshooting
| Problem | Possible Solution |
|---|---|
| Headphones not pairing. | Ensure earbuds are charged. Place them back in the case, close, then reopen to re-enter pairing mode. Turn off and on Bluetooth on your device. Try pairing with another device to rule out device issues. |
| No sound or low volume. | Check device volume and headphone volume. Ensure earbuds are properly seated in your ears. Reconnect Bluetooth. Check EQ settings in the EarFun App. |
| Call quality issues. | Ensure microphones are not obstructed. Move to an area with less background noise. Check for firmware updates via the EarFun App. |
| Headphones not charging. | Ensure USB-C cable is properly connected to both the case and power source. Check if the charging port is clean. Try a different USB-C cable or power adapter. |
| Intermittent connection. | Ensure no physical obstructions between headphones and device. Keep device within Bluetooth range (typically 10 meters). Avoid areas with strong Wi-Fi or other wireless interference. |
For further assistance, please refer to the Support section.
Specifications
| Feature | Detail |
|---|---|
| Model Name | EarFun OpenJump (OW100B) |
| Connectivity Technology | Wireless (Bluetooth 5.3) |
| Ear Placement | Open Ear |
| Audio Driver Type | 14.2mm Wool Composite Dynamic Driver |
| Frequency Response | 20Hz - 40kHz |
| Microphones | 4 AI-Enhanced Beamforming Mics |
| Battery Life (Single Charge) | Up to 11 Hours |
| Total Playtime (with Charging Case) | Up to 42 Hours |
| Water Resistance Level | IPX7 Waterproof |
| Control Type | Touch Control |
| Item Weight (per earbud) | 0.28oz (approx. 7.9g) |
| Product Dimensions | 3 x 2.63 x 1.07 inches |
| Material | Silicone, Acrylonitrile Butadiene Styrene (ABS) |
| Country of Origin | China |
Note: Specifications are subject to change without notice.
Warranty and Support
EarFun products are designed with quality and reliability in mind. For detailed warranty information, please refer to the official EarFun website or the warranty card included with your product. EarFun is committed to providing excellent customer service and regularly releases firmware updates to enhance product performance.
If you encounter any issues or have questions regarding your EarFun OpenJump headphones, please contact EarFun customer support through their official channels. You can also find additional resources and FAQs on the EarFun brand store on Amazon or their official website.
A PDF version of the user manual is available for download: Download User Manual (PDF)
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