OFNEX X19-black
OFNEX Wireless Earbuds Bluetooth 5.3 Headphones User Manual
Model: X19-black | Brand: OFNEX
1. Introduction
Welcome to the user manual for your new OFNEX Wireless Earbuds Bluetooth 5.3 Headphones. These earbuds are designed to provide a superior audio experience with features like extended playtime, crystal-clear calls, and a secure fit for active lifestyles. This manual will guide you through the setup, operation, maintenance, and troubleshooting of your device to ensure optimal performance and longevity.
2. What's in the Box
Upon opening your OFNEX Wireless Earbuds package, you should find the following items:
- Wireless Charging Case
- User Manual
- Eartips (four pairs: XS, S, M, L)
- USB-C Cable
- Earbuds (Left and Right)

Image: All components included in the OFNEX Wireless Earbuds package.
3. Product Overview
The OFNEX X19-black Wireless Earbuds feature an ergonomic design with secure earhooks, a compact charging case, and intuitive controls. Familiarize yourself with the main components:
- Earbuds: Equipped with physical buttons for control and integrated microphones for calls.
- Earhooks: Flexible and secure-fit design to keep earbuds in place during activity.
- Charging Case: Houses and charges the earbuds, featuring a dual LED power display for battery status.
- USB-C Port: For wired charging of the case.
- Reset Button: Located inside the charging case for easy factory reset.

Image: The OFNEX X19-black Wireless Earbuds and their charging case.

Image: Dual LED Digital Display on the charging case, showing battery levels for the case and individual earbuds.

Image: The charging case supports both wireless and USB-C charging.
4. Setup
4.1 Initial Charging
Before first use, fully charge the earbuds and the charging case. The case can be charged via the included USB-C cable or wirelessly using a Qi-certified charging pad (not included). The dual LED display on the case will show the charging progress and battery levels.
- Connect the USB-C cable to the charging case and a power source.
- Alternatively, place the charging case on a wireless charging pad.
- The earbuds will charge automatically when placed inside the case.
- A full charge provides up to 8 hours of listening time for the earbuds, and the case extends total playtime to 90 hours.
4.2 Pairing with Your Device
The earbuds utilize advanced Bluetooth 5.3 technology for a fast and stable connection.
- Ensure the earbuds are charged and inside the charging case.
- Open the charging case. The earbuds will automatically enter pairing mode.
- On your device (smartphone, tablet, laptop, etc.), go to Bluetooth settings and turn Bluetooth on.
- Search for "X19" in the list of available devices and select it to connect.
- Once connected, the earbuds will automatically pair with your device in subsequent uses when taken out of the case.
4.3 Secure Fit and Comfort
The X19-black earbuds are designed with flexible, secure-fit earhooks and come with four sizes of rubber ear tips (XS, S, M, L) to ensure a comfortable and stable fit, especially during vigorous activities.
- Choose the ear tip size that provides the best seal and comfort for your ears.
- Gently place the earbud into your ear canal and adjust the earhook over your ear until it feels snug and secure.
- Proper fit is crucial for optimal sound quality and to prevent the earbuds from slipping.

Image: The secure earhook design and multiple eartip sizes ensure a comfortable and stable fit for various activities.
5. Operating Your Earbuds
5.1 Controls
Each earbud is equipped with independent multi-function and volume buttons, allowing for comprehensive control over music playback, calls, and voice assistant activation.

Image: Dual audio control layout on the earbuds.
| Action | Function (Left Earbud) | Function (Right Earbud) |
|---|---|---|
| Single Press | Play/Pause Music, Answer/End Call | Play/Pause Music, Answer/End Call |
| Double Press | Previous Track | Next Track |
| Triple Press | Volume Down | Volume Up |
| Press and Hold (2s) | Activate Voice Assistant (Siri, Google Assistant) | Reject Call |
5.2 Call Functionality
The earbuds feature two built-in microphones for enhanced call performance, ensuring clear and loud voice transmission during phone conversations, web meetings, or online classes.
- To answer an incoming call, single press either earbud's multi-function button.
- To end an active call, single press either earbud's multi-function button.
- To reject an incoming call, press and hold the right earbud's multi-function button for 2 seconds.
5.3 Single and Dual Earbud Use
You can use both earbuds together for a stereo experience or use a single earbud independently. Each earbud has full volume and track control functions, providing flexibility.
- To use a single earbud, simply take one out of the case. It will automatically connect to your device if previously paired.
- To switch back to dual use, take the other earbud out of the case. They will automatically connect to each other and your device.
6. Maintenance
Proper care and maintenance will extend the life of your OFNEX Wireless Earbuds.
- Cleaning: Regularly clean the earbuds, ear tips, and charging contacts with a soft, dry, lint-free cloth. Do not use harsh chemicals or abrasive materials.
- Water Resistance: The earbuds are IPX7 waterproof, meaning they are protected against water droplets and sweat. They are suitable for workouts and running but should not be submerged in water or used for swimming. Ensure they are dry before placing them back in the charging case.
- Storage: When not in use, store the earbuds in their charging case to protect them and keep them charged. Store the case in a cool, dry place away from extreme temperatures.
- Battery Care: To preserve battery life, avoid fully discharging the earbuds and charging case frequently. Charge them regularly, even if not in daily use.
7. Troubleshooting
If you encounter any issues with your OFNEX Wireless Earbuds, refer to the following common solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Earbuds not pairing/connecting | Out of range, low battery, pairing error. | Ensure earbuds are charged. Place them back in the case, close, then open again. Turn Bluetooth off/on on your device. Try resetting the earbuds. |
| Only one earbud working | Earbuds not connected to each other, low battery on one earbud. | Place both earbuds in the charging case, close the lid, then open it again. Ensure both are charged. Perform a factory reset. |
| No sound or low volume | Volume too low on device/earbuds, improper fit, earbud blockage. | Adjust volume on both earbuds and connected device. Ensure earbuds are properly seated in your ears. Clean ear tips and earbud mesh. |
| Charging issues | Dirty charging contacts, faulty cable/charger, case battery empty. | Clean charging contacts on earbuds and case. Try a different USB-C cable or power adapter. Ensure the charging case itself is charged. |
7.1 One-key Reset
If you experience persistent issues, a factory reset can often resolve them. The charging case is equipped with a reset button for convenience.
- Place both earbuds into the charging case.
- Press and hold the reset button located inside the charging case for approximately 10 seconds until the LED indicators on the earbuds flash.
- This will restore the earbuds to their factory settings, clearing all previous pairing information. You will need to re-pair them with your device.
8. Specifications
| Model Name | X19-black |
| Connectivity Technology | Wireless (Bluetooth 5.3) |
| Playtime (Earbuds) | Up to 8 hours (single charge) |
| Total Playtime (with Charging Case) | Up to 90 hours |
| Charging Time | Approx. 2 hours (for case and earbuds) |
| Water Resistance Level | IPX7 Waterproof |
| Audio Driver Size | 14.2 mm Dynamic Driver |
| Frequency Range | 20Hz - 20,000Hz |
| Bluetooth Range | 10 Meters |
| Control Type | Button Control |
| Ear Placement | Over Ear (with Earhooks) |
| Item Weight (Earbuds + Case) | 149 Grams (approx. 5.3 ounces) |
| Product Dimensions | 3.94 x 2.41 x 1.38 inches |
9. Warranty and Support
OFNEX is committed to providing high-quality products and excellent customer service. Your OFNEX Wireless Earbuds are backed by a comprehensive warranty.
9.1 Warranty Information
For detailed warranty terms and conditions, please refer to the official OFNEX website or contact customer support. OFNEX offers a 365-day free return policy for customer satisfaction.
9.2 Customer Support
If you have any questions, concerns, or require assistance with your OFNEX Wireless Earbuds, please do not hesitate to contact OFNEX customer support. Our dedicated team is ready to help you resolve any issues and ensure your complete satisfaction.
For further assistance, you may also refer to the official User Manual PDF available online: OFNEX X19 User Manual PDF
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