1. Introduction
This instruction manual provides essential information for the proper setup, operation, and maintenance of your AYVVPII Silent UHF9 Rechargeable Wireless Silent Disco Headphones and Transmitter system. Please read this manual thoroughly before use to ensure optimal performance and longevity of your product.

2. Package Contents
Verify that all items listed below are included in your package. If any items are missing or damaged, please contact customer support.
- AYVVPII Silent UHF9 Wireless Headphones (10 units)
- UHF Transmitter (1 unit)
- USB Charging Cables (for headphones)
- 3.5mm Audio Cable
- RCA to 3.5mm Audio Adapter Cable
- Power Adapter (for transmitter)

3. Product Overview
3.1 Headphones
The AYVVPII Silent UHF9 headphones are designed for wireless audio transmission, featuring LED lights that indicate the selected channel and pulse with the music. They offer a comfortable over-ear design with 40mm dynamic drivers for balanced, high-definition sound.
- LED Lighting: Integrated LED lights on the earcups flash to the beat of the music and change color to indicate the active channel (Red, Green, Blue for Channels 1, 2, 3 respectively).
- Audio Channels: Supports up to 3 distinct audio channels.
- Sound Quality: Advanced 40mm speakers provide clear and balanced audio.
- Battery: Built-in 600mAh rechargeable battery, offering 8-10 hours of use on a 3-hour charge.
- Wired Mode: Can be used as standard wired headphones with a 3.5mm audio cable.

3.2 Transmitter
The UHF transmitter broadcasts audio signals to the headphones over a long distance, enabling multi-channel silent disco experiences.
- Range: Up to 500 meters (1640 feet) in open spaces.
- Channels: Each transmitter supports one audio channel. Multiple transmitters are required for multi-channel setups (up to 3 channels).
- Connectivity: Connects to audio sources via 3.5mm audio jack or RCA output.
- Compatibility: Works with mixers, PCs, CD/DVD/TV players, and other devices with compatible audio outputs.
- Scalability: One transmitter can work with an unlimited number of headphones simultaneously within its effective range.

4. Setup Guide
Follow these steps to set up your AYVVPII Silent UHF9 system:
- Charge Headphones: Connect the headphones to a USB power source using the provided USB charging cables. Ensure they are fully charged before first use (approximately 3 hours). The indicator light will change when charging is complete.
- Connect Transmitter: Connect the UHF transmitter to your audio source (e.g., mixer, PC, TV) using the 3.5mm audio cable or RCA adapter. Plug the power adapter into the transmitter and a power outlet.
- Power On Transmitter: Turn on the transmitter. The power indicator light will illuminate. Select the desired channel on the transmitter if multiple channels are available.
- Power On Headphones: Press and hold the ON/OFF/TUNE button on each headphone for approximately 2 seconds to power them on.
- Select Channel on Headphones: Once powered on, tap the ON/OFF/TUNE button to cycle through the available channels (Channel 1: Red LED, Channel 2: Green LED, Channel 3: Blue LED) until you hear the audio from the transmitter.

5. Operation
5.1 Power On/Off
To power on the headphones, press and hold the ON/OFF/TUNE button for 2 seconds. To power off, repeat the action.
5.2 Channel Selection
After powering on, tap the ON/OFF/TUNE button to switch between available audio channels. The LED light on the headphone will change color (Red, Green, Blue) to indicate the currently selected channel.
5.3 Volume Control
Use the Volume+ and Volume- buttons located on the earcup to adjust the listening volume to your preference.
5.4 LED Light Control
The headphones feature a dedicated button to turn the LED flashing lights on or off, allowing for use with or without the visual effect.
5.5 Wired Mode
To use the headphones in wired mode, connect a 3.5mm audio cable from your audio source directly to the headphone's audio import jack. This bypasses the wireless function and allows use as standard headphones.

6. Maintenance
6.1 Charging
Regularly charge the headphones and transmitter to ensure they are ready for use. Use only the provided charging cables and power adapter. Avoid overcharging.
6.2 Cleaning
Wipe the headphones and transmitter with a soft, dry cloth. Do not use harsh chemicals or abrasive materials. Keep connection ports free of dust and debris.
6.3 Storage
Store the system in a cool, dry place away from direct sunlight and extreme temperatures. When storing for extended periods, ensure devices are partially charged (around 50%) to preserve battery health.
7. Troubleshooting
If you encounter issues with your AYVVPII Silent UHF9 system, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from headphones | Headphones not powered on, incorrect channel selected, low battery, transmitter off or not connected to audio source. | Ensure headphones are powered on and charged. Verify the correct channel is selected on headphones. Check transmitter power and audio connection. |
| Static or poor audio quality | Interference, headphones out of range, low battery on headphones or transmitter, loose audio connection. | Move closer to the transmitter. Ensure both headphones and transmitter are fully charged. Check all audio cable connections. Avoid strong electromagnetic interference sources. |
| LED lights not working | LED feature turned off, low battery, malfunction. | Press the LED control button to activate lights. Charge headphones. If issue persists, contact support. |
| Transmitter not powering on | Power adapter not connected, faulty power outlet. | Ensure power adapter is securely connected to the transmitter and a working power outlet. |
8. Specifications
| Feature | Specification |
|---|---|
| Brand | AYVVPII |
| Model Number | Silent UHF9 |
| Color | Black |
| Ear Placement | Over Ear |
| Form Factor | Over Ear |
| Impedance | 32 Ohms |
| Connectivity Technology | RF, Wireless |
| Headphone Jack | 3.5 mm Jack |
| Noise Control | Active Noise Cancellation |
| Frequency Range | 30 Hz - 20 kHz |
| Audio Driver Type | Dynamic Driver |
| Enclosure Material | Plastic |
| Compatible Devices | Televisions, Personal Computers, MP3 Players, Speakers, Devices with 3.5mm audio input |
| Water Resistance Level | Not Water Resistant |
| Control Type | Volume Control, Touch |
| GTIN | 600609271681 |
9. Safety Information
- Do not disassemble the product without professional knowledge. Unauthorized disassembly may void the warranty and cause damage.
- Avoid exposing the product to extreme temperatures, humidity, or direct sunlight.
- Keep the product away from water and other liquids.
- Do not use damaged cables or power adapters.
- Prolonged listening at high volumes can cause hearing damage. Adjust volume to a safe level.
10. Warranty and Support
For warranty information, technical support, or any questions regarding your AYVVPII Silent UHF9 system, please refer to the contact information provided at the point of purchase or visit the official AYVVPII website.