Introduction
Thank you for choosing the GOSCIEN Bluetooth Headset V5.1. This ultralight, hands-free wireless earpiece is designed for business and daily use, featuring a noise-canceling microphone, LED battery display case, and extended standby time. This manual will guide you through the setup, operation, maintenance, and troubleshooting of your new headset to ensure optimal performance and a seamless user experience.
What's in the Box

Your GOSCIEN Bluetooth Headset package includes all necessary components to get started. Please verify that all items listed below are present in your box:
- GOSCIEN Bluetooth Headset
- Charging Case
- USB Charging Cable
- User Manual
- Multiple sizes of ear tips (L, M, S)
Product Overview and Features
The GOSCIEN Bluetooth Headset YYK-520-2 is engineered for superior audio quality and user convenience. Key features include:
Long Battery Life

Equipped with a 500mAh battery LED charging case, the headset can be fully charged in 1.5 hours. The earpiece offers approximately 120 hours of continuous use with the charging case, which provides 7-8 full charges for the wireless earpiece. Enjoy up to 8 hours of music time and 10 hours of talking time on a single charge of the headset.
Bluetooth 5.1 Technology

The headset utilizes advanced Bluetooth 5.1 chip technology, ensuring a more stable and clear connection. This allows for crystal-clear calls, making conversations feel face-to-face, and prevents interruptions during music playback or calls.
Dual-Mic Noise Reduction

Featuring advanced dual-mic call noise reduction, the GOSCIEN wireless earpiece ensures pure sound quality and clear voice calls even in noisy environments. High-quality moving coil units and equalization technology deliver superior audio performance.
Comfortable Wearing Design

Designed for in-ear comfort, the headset can be worn on either the left or right ear. The flexible ear hook rotates 180° vertically and 360° horizontally, allowing for a comfortable and secure fit for extended periods. It is lightweight and designed for hours of wear.
Convenient Button Control

Multifunctional buttons provide easy control over various functions. The headset supports voice assistant activation and features a built-in microphone for answering/rejecting calls and muting. Easily mute/unmute calls with a dedicated button press.
Setup
1. Charging the Headset and Case
Before first use, fully charge both the headset and the charging case.
- Connect the provided USB Type-C charging cable to the charging port on the case and to a USB power source (e.g., computer, wall adapter).
- Place the headset into the charging case. The LED display on the case will show the battery percentage, indicating charging status.
- Allow approximately 1.5 hours for a full charge of the headset. The case itself will also charge during this time.
2. Bluetooth Pairing
Pair your GOSCIEN Bluetooth Headset with your device (smartphone, tablet, laptop).
- Ensure the headset is charged and powered on. If it's in the case, take it out.
- On your device, go to the Bluetooth settings.
- Turn on Bluetooth.
- Search for available devices. The headset should appear as "YYK-520" or similar.
- Select "YYK-520" to connect. Once connected, you will hear a confirmation tone from the headset.
- The headset supports connecting to two devices simultaneously. After pairing with the first device, disable Bluetooth on the first device, then pair with the second device. Re-enable Bluetooth on the first device, and the headset should automatically connect to both.

The headset can maintain a fast and stable pairing connection up to 33 feet (15 meters).
Operating Instructions
Familiarize yourself with the multi-function buttons for seamless control.

The headset features intuitive button controls for various functions, including call management, music playback, and voice assistant activation.
Call Management
- Answer/End Call: Press the Multi-function Button once.
- Reject Call: Press and hold the Multi-function Button for 2 seconds.
- Mute/Unmute: Press the Mute Button (often a dedicated button or a long press on volume down during a call).
- Third-party Call Handover: Refer to your phone's specific instructions for handling multiple calls.
Music Playback
- Play/Pause: Press the Multi-function Button once.
- Next Song: Press the Volume Up button for 2 seconds.
- Previous Song: Press the Volume Down button for 2 seconds.
- Volume Up: Short press the Volume Up button.
- Volume Down: Short press the Volume Down button.
Voice Assistant (Siri/Google Assistant)

Activate your device's voice assistant (Siri, Google Assistant) directly from the headset.
- Activate Voice Assistant: Press the Multi-function Button twice quickly.
Wearing the Headset


The headset is designed for comfortable wear on either ear. Adjust the ear hook by rotating it 180° vertically and 360° horizontally to find your optimal fit. Choose the appropriate ear tip size (L, M, S) for the best seal and comfort.
Maintenance
Proper care will extend the life and performance of your GOSCIEN Bluetooth Headset.
- Cleaning: Use a soft, dry, lint-free cloth to clean the headset and charging case. Do not use harsh chemicals or abrasive materials.
- Storage: When not in use, store the headset in its charging case to protect it from dust and damage. Store in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: To preserve battery life, avoid fully discharging the battery frequently. Charge the headset regularly, even if not in constant use.
- Water Resistance: The headset is designed to withstand sweat and light splashes (IPX7 rating). Do not submerge the headset in water or expose it to heavy rain. Ensure the charging port is dry before charging.
Troubleshooting
If you encounter issues with your headset, try the following solutions:
| Problem | Possible Solution |
|---|---|
| Headset does not turn on | Ensure the headset is charged. Place it in the charging case for a few minutes, then try again. |
| Cannot pair with device | Make sure Bluetooth is enabled on your device. Ensure the headset is in pairing mode (usually indicated by a flashing light). Turn off and on Bluetooth on your device. Forget the device from your Bluetooth list and try pairing again. |
| No sound or low volume | Check the volume levels on both the headset and your connected device. Ensure the headset is properly connected. Try playing different audio sources. |
| Call quality is poor | Ensure you are within Bluetooth range of your device. Check for interference from other wireless devices. Ensure the microphone is not blocked. |
| Charging issues | Verify the charging cable is securely connected. Try a different USB port or power adapter. Ensure the charging contacts on the headset and case are clean. |
Specifications
| Model Number | YYK-520-2 |
| Bluetooth Version | 5.1 |
| Charging Case Battery Capacity | 500mAh |
| Headset Charging Time | Approx. 1.5 hours |
| Music Playback Time | Up to 8 hours |
| Talking Time | Up to 10 hours |
| Standby Time (with charging case) | Approx. 120 hours |
| Connectivity Technology | Wireless, Bluetooth |
| Microphone | Dual-mic with Noise Reduction (CVC8.0) |
| Ear Placement | On Ear / In Ear (adjustable) |
| Material | Plastic |
| Color | Black |
| Dimensions (Package) | 14.5 x 7.8 x 2.8 cm |
| Weight (Package) | 120 g |
Warranty and Support
GOSCIEN products are manufactured to the highest quality standards. This product comes with a standard manufacturer's warranty against defects in materials and workmanship. For specific warranty terms and conditions, please refer to the warranty card included in your product packaging or visit the official GOSCIEN website.
If you require technical support, have questions about your product, or need assistance with troubleshooting, please contact GOSCIEN customer service through the contact information provided on the product packaging or the official website. Please have your model number (YYK-520-2) and purchase details ready when contacting support.