Airfrex Bluetooth 5.4 Transmitter Adapter User Manual

1. Introduction

The Airfrex Bluetooth 5.4 Transmitter Adapter is designed to provide high-fidelity wireless audio transmission from non-Bluetooth devices to your Bluetooth-enabled headphones, earbuds, or speakers. Featuring the advanced Qualcomm Bluetooth 5.4 chipset, it supports aptX Adaptive, aptX Low Latency (LL), AAC, SBC, and MP3 codecs, ensuring a seamless and high-quality audio experience with minimal delay. This compact and versatile device is ideal for use with TVs, PCs, laptops, MP3 players, gym equipment, and in-flight entertainment systems.

Figure 1: Airfrex Bluetooth 5.4 Transmitter Adapter and included accessories.

2. What's in the Box

Please check the package contents to ensure all items are present:

• Airfrex Bluetooth Transmitter
• AUX Extended Cable (3.5mm)
• Airplane Adapter (Dual 3.5mm)
• USB Charging Cable

Figure 2: Diagram illustrating product usage and package contents.

3. Key Features

• Qualcomm Bluetooth 5.4 Chipset: Utilizes the most advanced Qualcomm Bluetooth 5.4 chip for high-fidelity lossless audio transmission, supporting FLAC, AAC, SBC, and MP3 codecs.
• aptX Adaptive & Low Latency: Guarantees high-quality sound performance and a real-time audio-visual experience with minimum delay, ideal for music, TV, movies, sports, and gaming.
• Wide Compatibility: Compatible with any audio device featuring a 3.5mm AUX output, including TVs, PCs, laptops, MP3/MP4 players, CD/VCD/DVD players, gym equipment, iPod classic, PS5, and Xbox consoles.
• Dual Link Functionality: Designed for connecting to two wireless headphones simultaneously, allowing shared audio experiences with family or friends.
• Plug & Play Setup: Simple one-button operation for auto-connection, reconnection, connecting a second device, and resetting pairing records. LED light indicates status.
• Compact and Portable: Ultra-compact and lightweight aluminum alloy casing with a premium finish. Supports charging while in use.

Figure 3: High-quality audio supported by Qualcomm aptX HD and aptX Adaptive.

Figure 4: The advanced Qualcomm Bluetooth 5.4 chipset inside the Airfrex transmitter.

4. Setup Guide

4.1 Initial Power On and Pairing

1. Power On: Press and hold the multi-function button for approximately 3 seconds until the blue LED indicator flashes rapidly. This indicates the device is powered on and in pairing mode.
2. Connect to Audio Source: Plug the 3.5mm AUX jack of the transmitter into the audio output port of your desired device (e.g., TV, PC, MP3 player). If using with an airplane entertainment system, use the included dual 3.5mm airplane adapter.
3. Enable Pairing on Headphones: Put your Bluetooth headphones or earbuds into pairing mode. Refer to your headphone's user manual for specific instructions.
4. Automatic Connection: The Airfrex transmitter will automatically search for and connect to nearby Bluetooth audio devices in pairing mode. Once connected, the blue LED will slow down its flashing or turn solid, depending on the connection status.

4.2 Connecting a Second Device (Dual Link)

The Airfrex transmitter supports connecting two Bluetooth headphones simultaneously for shared listening.

1. Ensure the first headphone is already connected to the transmitter.
2. Double-click the multi-function button on the Airfrex transmitter. The blue LED will flash rapidly again, indicating it's searching for a second device.
3. Put your second Bluetooth headphone into pairing mode.
4. The transmitter will automatically connect to the second headphone. Once both are connected, the LED indicator will confirm the dual connection status.

Figure 5: Enjoying shared audio with the Dual Link feature.

5. Operating Instructions

5.1 Power On/Off

• Power On: Press and hold the multi-function button for 3 seconds.
• Power Off: Long press the multi-function button for 5 seconds.

5.2 Resetting Pairing Records

To clear all previously paired devices and reset the transmitter:

• With the device powered on, long press the multi-function button for approximately 8 seconds until the LED indicator changes, signifying that the pairing records have been cleared. The device will then enter pairing mode.

5.3 Charging

Connect the included USB charging cable to the charging port on the transmitter and a USB power source (e.g., computer USB port, wall adapter). The LED indicator will show charging status. The device supports charging while in use.

6. Compatibility

The Airfrex Bluetooth Transmitter is designed for broad compatibility with various audio sources and Bluetooth receiving devices:

• Audio Sources: TVs, PCs, Laptops, Desktops, MP3/MP4 players, CD/VCD/DVD players, gym equipment (e.g., treadmills), iPod classic, PS5, Xbox video gaming consoles, and any device with a 3.5mm AUX audio output.
• Bluetooth Receiving Devices: Bluetooth headphones, wireless headsets, earbuds (including Airpods), and Bluetooth speakers.

Figure 6: Perfect for air travel, connecting to in-flight entertainment.

Figure 7: Stream wirelessly from gym equipment.

7. Maintenance

To ensure the longevity and optimal performance of your Airfrex Bluetooth Transmitter, please follow these maintenance guidelines:

• Cleaning: Use a soft, dry cloth to clean the device. Do not use liquid cleaners or aerosols.
• Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
• Handling: Avoid dropping the device or subjecting it to strong impacts.
• Moisture: Keep the device away from water and high humidity.

8. Troubleshooting

If you encounter issues with your Airfrex Bluetooth Transmitter, please refer to the following common problems and solutions:

No Power/Device Not Turning On:

Ensure the device is fully charged. Connect it to a power source using the USB charging cable and allow it to charge for at least 30 minutes before attempting to power on again.

Cannot Pair with Headphones:

• Ensure both the transmitter and your headphones are in pairing mode.
• Make sure the transmitter is within range (typically 10 meters/33 feet) of your headphones.
• Clear the pairing records on the transmitter (long press button for 8 seconds) and try pairing again.
• If your headphones were previously paired with another device, disconnect them from that device or clear their pairing history.

No Audio or Poor Audio Quality:

• Ensure the 3.5mm AUX jack is fully inserted into the audio source.
• Check the volume levels on both the audio source and your headphones.
• Verify that the correct audio output is selected on your source device (e.g., TV audio settings).
• Move the transmitter closer to your headphones to reduce interference.
• Ensure there are no significant physical obstructions between the transmitter and headphones.

Audio Delay/Latency:

While the device supports aptX Low Latency, some factors can still introduce minor delays. Ensure your receiving headphones also support aptX Low Latency for the best performance. Reduce distance and minimize interference.

9. Specifications

10. Safety Information

Please read and adhere to the following safety precautions:

• Battery Handling: This device contains a nonstandard battery. Do not attempt to replace the battery yourself. Dispose of the device and its battery according to local regulations. Avoid exposing the battery to excessive heat, direct sunlight, or fire.
• Potential Interference: This device operates using radio frequencies and may cause interference with other electronic devices, medical equipment (e.g., pacemakers), or in environments sensitive to radio signals (e.g., hospitals, aircraft). Always follow applicable regulations and turn off the device when instructed.
• Choking Hazard: Keep the device and its small parts out of reach of children and pets to prevent accidental ingestion.

11. Warranty and Support

For warranty information, technical support, or customer service inquiries, please contact Airfrex directly through the retailer's platform or visit the official Airfrex website. Please retain your proof of purchase for warranty claims.

12. Product Video