1. Product Overview
The Remax RB-520HB are versatile over-ear headphones designed for both wireless Bluetooth and wired audio connections. They offer a comfortable fit and clear sound for various audio needs.

Image 1.1: Front view of the Remax RB-520HB Bluetooth Headphones, showcasing the red finish and over-ear design.
2. Package Contents
Please check the package for the following items:
- Remax RB-520HB Bluetooth Headphones
- USB Charging Cable
- 3.5mm Audio Cable
- User Manual

Image 2.1: The packaging box for the Remax RB-520HB headphones, indicating product branding and model.
3. Component Identification
Familiarize yourself with the various buttons and ports on your headphones:

Image 3.1: Detailed view of the control buttons and ports located on the earcup of the Remax RB-520HB headphones.
- Power Button / Multi-function Button (MFB): Used for powering on/off, play/pause, answering/ending calls, and Bluetooth pairing.
- Volume Up / Next Track Button: Short press for volume up, long press for next track.
- Volume Down / Previous Track Button: Short press for volume down, long press for previous track.
- LED Indicator: Shows power status, charging status, and Bluetooth pairing status.
- Microphone: For hands-free calling.
- 3.5mm Audio Jack: For wired connection.
- Micro USB Charging Port: For charging the headphones.
4. Setup Instructions
4.1. Charging the Headphones
Before first use, fully charge the headphones. Connect the Micro USB charging cable to the charging port on the headphones and the other end to a USB power adapter (not included) or a computer's USB port. The LED indicator will show charging status and turn off or change color when fully charged.
4.2. Powering On/Off
- To Power On: Press and hold the MFB for approximately 3 seconds until the LED indicator flashes blue and a voice prompt confirms "Power On".
- To Power Off: Press and hold the MFB for approximately 3 seconds until the LED indicator flashes red and a voice prompt confirms "Power Off".
4.3. Bluetooth Pairing
To connect your headphones wirelessly to a device:
- Ensure the headphones are powered off.
- Press and hold the MFB for approximately 5-7 seconds until the LED indicator flashes red and blue alternately. This indicates pairing mode.
- Enable Bluetooth on your device (smartphone, tablet, computer).
- Search for available Bluetooth devices and select "RB-520HB" from the list.
- Once connected, the LED indicator will flash blue slowly, and a voice prompt will confirm "Connected".
Note: The headphones will automatically attempt to reconnect to the last paired device when powered on.
4.4. Wired Connection
To use the headphones with a wired connection:
- Insert one end of the 3.5mm audio cable into the audio jack on the headphones.
- Insert the other end into the 3.5mm audio output of your device.
- The headphones will function as passive wired headphones. Bluetooth functionality will be disabled when the audio cable is connected.
5. Operating Instructions
5.1. Music Playback
- Play/Pause: Short press the MFB.
- Volume Up: Short press the "Volume Up / Next Track" button.
- Volume Down: Short press the "Volume Down / Previous Track" button.
- Next Track: Long press the "Volume Up / Next Track" button.
- Previous Track: Long press the "Volume Down / Previous Track" button.
5.2. Call Management
- Answer/End Call: Short press the MFB.
- Reject Call: Long press the MFB for 2 seconds.
- Redial Last Number: Double-press the MFB.
6. Maintenance and Care
To ensure the longevity and optimal performance of your headphones, follow these guidelines:
- Cleaning: Use a soft, dry cloth to clean the headphones. Do not use abrasive cleaners or solvents.
- Storage: Store the headphones in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: Avoid fully discharging the battery frequently. Charge the headphones regularly, even if not in use, to maintain battery health.
- Water Exposure: These headphones are not waterproof. Avoid exposure to water or excessive moisture.
7. Troubleshooting
If you encounter any issues, please refer to the following common solutions:
| Problem | Solution |
|---|---|
| Headphones do not power on. | Ensure the headphones are charged. Connect to a power source and try again. |
| Cannot pair with Bluetooth device. |
|
| No sound when connected. |
|
| Poor audio quality. |
|
8. Specifications
Detailed technical specifications for the Remax RB-520HB Bluetooth Headphones:
| Brand | Remax |
| Model Number | RB-520HB |
| Connectivity Technology | Wired, Wireless (Bluetooth) |
| Wireless Communication Technology | Bluetooth |
| Headphones Form Factor | On Ear / Over Ear |
| Headphones Ear Placement | Over Ear |
| Headphones Jack | 3.5 mm Jack |
| Noise Control | None |
| Frequency Response | 3045 |
| Product Dimensions | 23 x 23 x 11 cm |
| Item Weight | 670 g |
| Manufacturer | Remax |
| ASIN | B07K1SS8HR |

Image 8.1: Diagram illustrating the physical dimensions of the Remax RB-520HB headphones.
9. Warranty and Support
For warranty information, product support, or further inquiries, please contact Remax directly or visit their official channels.
- Official Website: http://www.iRemax.hk
- WeChat Support: Scan the QR code or visit http://weixin.qq.com/r/1nX27mjEGjVlrSyN9yDE
- Manufacturer: Remax
- Manufacturer Address: Shenzhen Remax Co., Limited, 5th Floor, Building B, Hongdeyuan Industrial Park, No. 108, Xixiang Road, Bao'an District, Shenzhen, China.
Please retain your proof of purchase for warranty claims.







