1. Introduction
Thank you for choosing the Jxrev J51 Wireless Earbuds. This manual provides essential information for setting up, operating, and maintaining your earbuds to ensure a high-quality audio experience. Please read this manual thoroughly before use and retain it for future reference.
2. Package Contents
Verify that all items are present in your package:
- Jxrev J51 Wireless Earbuds (Left and Right)
- Charging Case
- USB-C Charging Cable
- User Manual

Image: Contents of the Jxrev J51 Wireless Earbuds package.
3. Product Overview
The Jxrev J51 Wireless Earbuds are designed for a comfortable fit and high-quality audio. They feature Bluetooth 5.4 technology for stable connections, 13mm dynamic drivers for clear sound, and an integrated noise-cancelling microphone for calls.

Image: Jxrev J51 Wireless Earbuds and Charging Case.
Key Features:
- Bluetooth 5.4: Ensures a stable, low-latency wireless connection.
- 13mm Dynamic Drivers: Deliver impressive Hi-Fi stereo sound with deep bass.
- Noise-Cancelling Microphone: Provides clear call quality.
- IP7 Waterproof Rating: Offers protection against splashes and sweat.
- Ultra-Lightweight Design: Each earbud weighs approximately 3g for comfortable wear.

Image: Earbud internal components, illustrating Bluetooth 5.4 technology and noise-cancelling mic.

Image: 13mm large-size dynamic driver for enhanced audio.
4. Setup
4.1 Charging the Earbuds and Case
Before first use, fully charge the earbuds and charging case.
- Place the earbuds into the charging case. Ensure they are correctly seated.
- Connect the USB-C charging cable to the charging port on the case and to a power source.
- The indicator light on the charging case will show charging status. A full charge for the case takes approximately 1 hour.
- Once fully charged, disconnect the cable. The earbuds provide 6-8 hours of playtime on a single charge, with the charging case extending total playtime to 32 hours.

Image: Charging and battery life overview.
4.2 Pairing with Your Device
The earbuds feature one-step pairing for convenience.
- Ensure your device's Bluetooth is enabled.
- Open the charging case. The earbuds will automatically power on and enter pairing mode.
- On your device, search for Bluetooth devices and select "J51" from the list.
- Once connected, the earbuds will automatically connect to your device whenever you open the charging case.

Image: Bluetooth pairing process on a smartphone.
5. Operating Instructions
5.1 Power On/Off
- Power On: Open the charging case, and the earbuds will power on automatically.
- Power Off: Place the earbuds back into the charging case and close the lid. They will power off automatically.
5.2 Wearing the Earbuds
Insert the earbuds into your ears and adjust them for a secure and comfortable fit. The lightweight design (3g per earbud) ensures comfort during extended use and physical activity.

Image: Man demonstrating the lightweight and portable design.

Image: Earbuds worn during exercise.
5.3 Touch Controls
The earbuds feature intuitive touch controls on the stem of each earbud.
| Action | Left Earbud | Right Earbud |
|---|---|---|
| Play/Pause | Double Tap | Double Tap |
| Next Song | N/A | Hold 2 seconds |
| Previous Song | Hold 2 seconds | N/A |
| Volume Up | N/A | Single Tap |
| Volume Down | Single Tap | N/A |
| Answer/End Call | Double Tap | Double Tap |
| Reject Call | Hold 2 seconds | Hold 2 seconds |
| Activate Voice Assistant | Triple Tap | Triple Tap |

Image: Detailed touch control functions.
5.4 Call Functions
The built-in noise-cancelling microphone ensures clear conversations, even in noisy environments.

Image: Noise-cancelling microphone for clear calls.
6. Maintenance
6.1 Cleaning
- Regularly clean the earbuds and charging case with a soft, dry, lint-free cloth.
- Do not use abrasive cleaners, alcohol, or chemical solvents.
- Ensure charging contacts on both earbuds and case are clean and dry.
6.2 Storage
- When not in use, store the earbuds in their charging case to protect them and keep them charged.
- Store in a cool, dry place away from extreme temperatures.
6.3 Water Resistance (IP7)
The Jxrev J51 earbuds are IP7 waterproof, meaning they are protected against temporary immersion in water (up to 1 meter for 30 minutes). They are sweat-resistant and splashproof, making them suitable for sports and outdoor activities. However, they are not designed for swimming or prolonged water immersion. Ensure earbuds are dry before placing them back in the charging case.
7. Troubleshooting
If you encounter issues, refer to the following common problems and solutions:
- Earbuds not pairing:
Ensure earbuds are charged. Turn off and on your device's Bluetooth. Place earbuds back in the case, close, then reopen to re-enter pairing mode. - Only one earbud working:
Try resetting the earbuds (refer to specific reset instructions if available, otherwise place both in case, close, then reopen). Ensure both earbuds are charged. - No sound or low volume:
Check device volume. Ensure earbuds are properly connected. Clean any debris from earbud speakers. - Connection drops frequently:
Ensure no obstructions between earbuds and device. Move closer to your device. Avoid environments with strong Wi-Fi or other wireless interference. - Charging case not charging:
Check USB-C cable and power adapter. Ensure the cable is securely connected.
If problems persist, please contact customer support.
8. Specifications
| Feature | Specification |
|---|---|
| Model Name | J51 |
| Connectivity Technology | Wireless (Bluetooth) |
| Bluetooth Version | 5.4 |
| Bluetooth Range | 10 Meters |
| Audio Driver Size | 13 Millimeters |
| Frequency Range | 20 Hz - 20,000 Hz |
| Sensitivity | 35 dB |
| Battery Life (Single Charge) | 6-8 Hours |
| Total Playtime (with Case) | 32 Hours |
| Charging Time | 1 Hour (Case) |
| Charging Port | USB C |
| Water Resistance Level | IP7 Waterproof |
| Earbud Weight | Approximately 3g |
| Control Type | Touch Control |
| Compatible Devices | iOS and Android smartphones or tablets |
9. Safety Information
WARNING: Choking Hazard - Small Parts. Keep out of reach of small children.
- Do not disassemble, repair, or modify the product.
- Avoid exposing the product to extreme temperatures, direct sunlight, or fire.
- Do not use the earbuds at high volume for extended periods to prevent hearing damage.
- Use only the provided charging cable or a certified equivalent.
10. Warranty and Support
For warranty information or technical support, please refer to the product packaging or contact Jxrev customer service through the retailer where the product was purchased. Please have your model number (J51) and purchase details available.



