Introduction
Thank you for choosing the ZIHNIC WH-820 Bluetooth Over-Ear Headphones. These headphones are designed to provide a high-quality audio experience with deep bass, HiFi stereo sound, and the convenience of wireless connectivity. This manual will guide you through the setup, operation, and maintenance of your new headphones.

Image: ZIHNIC WH-820 Bluetooth Over-Ear Headphones with Bluetooth 5.3 technology highlighted.
Package Contents
Please check the package for the following items:
- ZIHNIC WH-820 Bluetooth Over-Ear Headphones
- Charging Cable (Type-C)
- 3.5mm Audio Cable
- User Manual
Controls and Indicators
Familiarize yourself with the buttons and ports on your headphones:

Image: Detailed view of headphone controls and ports.
- Voice Assistant / EQ Button: Press to activate voice assistant or cycle through EQ modes.
- ON/OFF Button: Power the headphones on or off.
- V+/Previous Button: Increase volume or skip to the previous track.
- V-/Next Button: Decrease volume or skip to the next track.
- LED Indicator: Shows power, charging, and pairing status.
- Type-C Charging Port: For charging the headphones.
- 3.5mm Audio Port: For wired connection.
- Mic: Built-in microphone for calls.
Setup
1. Charging the Headphones
Before first use, fully charge your headphones. Connect the provided Type-C charging cable to the charging port on the headphones and the other end to a USB power source (e.g., wall adapter, computer USB port). The LED indicator will show charging status and turn off or change color when fully charged. A full charge provides up to 32 hours of playback.
2. Powering On/Off
- To Power On: Press and hold the ON/OFF button for approximately 3 seconds until the LED indicator flashes.
- To Power Off: Press and hold the ON/OFF button for approximately 3 seconds until the LED indicator turns off.
3. Bluetooth Pairing
- Ensure the headphones are powered off.
- Press and hold the ON/OFF button for about 5-7 seconds until the LED indicator flashes red and blue alternately, indicating pairing mode.
- On your device (smartphone, tablet, PC), enable Bluetooth and search for available devices.
- Select "ZIHNIC WH-820" from the list of found devices.
- Once paired, the LED indicator will flash blue slowly or remain solid blue.
- The headphones have a Bluetooth range of up to 10 meters (33 feet).
4. Wired Mode (3.5mm Audio Cable)
You can use the headphones in wired mode even when the battery is depleted. Connect one end of the 3.5mm audio cable to the headphone's 3.5mm audio port and the other end to your audio source's 3.5mm jack. In wired mode, Bluetooth functions and button controls on the headphones will be disabled.
Operating Instructions
1. Basic Music Controls
- Play/Pause: Short press the ON/OFF button.
- Volume Up: Short press the V+ button.
- Volume Down: Short press the V- button.
- Next Track: Long press the V- button.
- Previous Track: Long press the V+ button.
2. Call Management
- Answer/End Call: Short press the ON/OFF button.
- Reject Call: Long press the ON/OFF button.
- Redial Last Number: Double-press the ON/OFF button.
3. EQ Modes
The headphones feature 5 different EQ modes to customize your audio experience. Short press the Voice Assistant / EQ button to cycle through the available sound profiles (e.g., Bass Boost, Vocal, Normal, etc.).
4. Voice Assistant Activation
Activate your device's voice assistant (Siri, Google Assistant, etc.) by long pressing the Voice Assistant / EQ button. This allows for hands-free control of your device.

Image: Activating voice assistant with ZIHNIC WH-820 headphones.
Maintenance
- Clean the headphones with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Avoid exposing the headphones to extreme temperatures, humidity, or dust.
- Store the headphones in a cool, dry place when not in use. The foldable design allows for compact storage.
- Do not attempt to disassemble or modify the headphones, as this will void the warranty.
Troubleshooting
| Problem | Solution |
|---|---|
| Headphones do not power on. | Ensure the headphones are charged. Connect to a power source using the Type-C cable. |
| Cannot pair with device. |
|
| No sound in wireless mode. |
|
| No sound in wired mode. |
|
| Microphone not working. |
|
Specifications
| Feature | Detail |
|---|---|
| Model | WH-820 |
| Brand | ZIHNIC |
| Connectivity Technology | Wireless (Bluetooth), Wired (3.5mm Jack) |
| Bluetooth Version | 5.3 |
| Bluetooth Range | Up to 10 meters (33 feet) |
| Driver Size | 40 mm |
| Frequency Response | 20 Hz - 20,000 Hz |
| Battery Life | Up to 32 hours (playback) |
| Control Type | Media Control (Tactile buttons) |
| Ear Placement | Over-Ear (Circum-Aural) |
| Noise Control | Sound Isolation |
| Material | Plastic |
| Special Features | Foldable, 5 EQ Modes, Built-in Microphone |
Warranty and Support
For warranty information and customer support, please refer to the warranty card included in your package or contact ZIHNIC customer service directly. Keep your purchase receipt for warranty claims.