Introduction
The VAORLO T66 is a versatile 2-in-1 Bluetooth 5.3 Audio Adapter designed to seamlessly convert wired audio systems into wireless ones. It functions as both a receiver (RX) and a transmitter (TX), enabling you to stream audio wirelessly to or from a wide range of devices. With its compact design, built-in microphone, and high-fidelity sound, the T66 enhances your audio experience in various settings, from your car to your home entertainment system.

Setup
Package Contents
Please check the package for the following items:
- 1x T66 Bluetooth Audio Transmitter Receiver
- 1x 3.5mm Audio Metal Converter Head
- 1x Charging Cable (Type-C)
- 1x User Manual

Device Overview
Familiarize yourself with the device's components:
- Lavalier Design: For easy clipping and portability.
- Multifunctional Button: Central button for power and pairing.
- 3.5mm Audio Jack: For connecting to audio equipment.
- MIC (Microphone): For hands-free calling (RX mode only).
- RX Mode Switch: Slide switch to 'RX' for receiver mode.
- TX Mode Switch: Slide switch to 'TX' for transmitter mode.
- Indicator Light: Displays device status (pairing, connected, charging).
- Type-C Fast Charging Port: For charging the device.

Charging the Device
The T66 features a built-in rechargeable lithium battery. To charge:
- Connect the provided Type-C charging cable to the adapter's charging port.
- Connect the other end of the cable to a USB power source (e.g., wall adapter, computer USB port).
- The indicator light will be solid red while charging.
- Once fully charged (approximately 1-2 hours), the red light will turn off.

Operating Instructions
Power On/Off
To power on the device, long press the multifunctional button for 3 seconds.
Receiver Mode (RX)
In RX mode, the T66 receives Bluetooth signals from your phone or other Bluetooth-enabled devices and transmits them to wired audio equipment (e.g., car stereo, home speakers, wired headphones).
- Connect the T66 to your audio equipment (e.g., car AUX port, speaker AUX input) using the 3.5mm audio cable.
- Slide the mode switch button to the RX position. The blue indicator light will flash rapidly, indicating it is ready for pairing.
- On your phone or other Bluetooth-enabled device, search for Bluetooth devices and select "T66" from the list.
- Once connected, the blue indicator light will stop flashing and remain solid.


Transmitter Mode (TX)
In TX mode, the T66 converts wired audio signals from non-Bluetooth devices (e.g., TV, PC) into Bluetooth signals, transmitting them to Bluetooth headphones or speakers.
- Connect the T66 to your audio source equipment (e.g., TV, PC, projector) using the 3.5mm audio cable.
- Slide the mode switch button to the TX position. The red indicator light will flash rapidly, indicating it is ready for pairing.
- Turn on your receiving Bluetooth device (e.g., Bluetooth headphones, Bluetooth speaker) and put it into pairing mode.
- The T66 will automatically connect to the nearby receiving Bluetooth device. Once connected, the red indicator light will stop flashing and remain solid.



Hands-free Calling
The T66 supports hands-free calling with its built-in microphone, but this feature is only available in Receiver (RX) Mode.

Specifications
| Feature | Specification |
|---|---|
| Model Number | T66 |
| Bluetooth Version | 5.3 + EDR |
| Wireless Type | Bluetooth |
| Interface | 3.5 MM, Type-C |
| Working Range | Up to 10 meters (15 meters in open area without obstacles) |
| Battery Capacity | 140mAh |
| Charging Time | 1-2 hours |
| Music Time | 8-10 hours |
| Standby Time | 90 days |
| Support Protocol | A2DP/AVRCP/HFP/SBC |
| Sound Track | Double |
| High Definition Support | None |
| Content | AUDIO |
| WIFI Standard | None |
| Certification | CE |
| Origin | Mainland China |
| Product Size | 60 x 22 x 13 mm |
| Frequency Response Range | 10Hz-20KHz |
| Signal-to-Noise Ratio | <110dB |

Maintenance
To ensure the longevity and optimal performance of your VAORLO T66 Audio Adapter, please follow these maintenance guidelines:
- Keep Dry: Avoid exposing the device to moisture, rain, or liquids, as this can damage internal components.
- Avoid Extreme Temperatures: Do not store or use the device in extremely hot or cold environments.
- Clean Gently: Use a soft, dry cloth to clean the device. Do not use harsh chemicals or abrasive cleaners.
- Charge Regularly: If the device is not used for an extended period, charge it at least once every three months to maintain battery health.
- Handle with Care: Avoid dropping or subjecting the device to strong impacts.
Troubleshooting
If you encounter issues with your T66 adapter, refer to the following common problems and solutions:
Common Faults
- No sound in Receiver (RX) Mode:
- Ensure your mobile device's Bluetooth is successfully connected to the T66.
- Verify that your audio equipment (e.g., speaker) is switched to AUX audio input mode.
- Cannot connect in Transmitter (TX) Mode:
- Confirm that the T66 is switched to TX mode (red indicator light flashing).
- Ensure the receiving Bluetooth headset/speaker is not connected to other devices (like a phone) and is in pairing mode.
- Some Bluetooth headsets may require initialization (factory reset) before they can connect to a new transmitter.
- Audio quality issues while charging:
- For optimal audio clarity, it is recommended to avoid using the 3.5mm Bluetooth transmitter-receiver while it is charging.
User Tips
- Microphone Functionality: The built-in microphone for hands-free calling is only supported when the T66 is operating in Receiver (RX) Mode. It is not active in Transmitter (TX) Mode.
- Dedicated Audio Device: The VAORLO T66 is designed exclusively for audio transmission. It cannot be used for data transfer with devices like keyboards, mice, or for file sharing.
- Transmitter Mode Pairing: When in Transmitter (TX) Mode, the T66 will not appear in your phone's, computer's, or TV's Bluetooth device list. Instead, it automatically connects to nearby Bluetooth receiving devices (like headphones or speakers) that are in pairing mode. Simply ensure your receiving device is ready to pair, and the T66 will establish the connection.
- Portability: The T66 features a convenient collar clip design, making it easy to carry with you for on-the-go use.
Warranty and Support
For warranty information, technical support, or any inquiries regarding your VAORLO T66 Bluetooth 5.3 Audio Adapter, please refer to the official VAORLO website or contact your seller directly. A detailed user manual is available in PDF format for download here.