1. Introduction
Thank you for choosing the Airfrex Bluetooth 5.3 Receiver Adapter. This device is designed to transform your wired audio systems into wireless ones, allowing you to stream music and make hands-free calls with ease. Featuring the latest Bluetooth 5.3 technology, a dedicated headphone amplifier, and a built-in microphone, it delivers superior sound quality and reliable connectivity.
2. Package Contents
- Airfrex Bluetooth 5.3 Receiver Adapter (AKU2)
- USB Charging Cable
- User Manual
3. Setup Guide
3.1 Charging the Device
Before first use, fully charge the Airfrex receiver. Connect the provided USB charging cable to the receiver's charging port and plug the other end into a USB power source (e.g., computer USB port, wall adapter). The LED indicator will show charging status.
Image: The Airfrex Bluetooth Receiver Adapter, showcasing its compact design and 3.5mm audio jack.
3.2 Pairing with a Bluetooth Device
- Ensure the Airfrex receiver is charged and powered off.
- Press and hold the multi-function button until the LED indicator flashes blue and red alternately, indicating it's in pairing mode.
- On your smartphone, tablet, or other Bluetooth-enabled device, go to the Bluetooth settings and search for new devices.
- Select "Airfrex AKU2" from the list of available devices.
- Once paired, the LED indicator will turn solid blue or flash blue slowly.
Image: A user wearing headphones with the Airfrex receiver plugged into the headphone jack, illustrating wireless audio streaming.
3.3 Connecting to Audio Systems
Plug the 3.5mm audio jack of the Airfrex receiver into the AUX input of your car stereo, home stereo system, wired headphones, or speakers.
Image: The Airfrex receiver connected to a pair of large over-ear headphones, with a smartphone displaying a music player interface in the background, demonstrating its use as a wireless headphone amplifier.
Image: The Airfrex receiver connected to a pair of in-ear headphones, with a smartphone displaying a music player interface, showing its versatility with different headphone types.
Image: The Airfrex receiver plugged into the AUX port of a car's center console, with a smartphone nearby, illustrating its application as a car kit.
4. Operating Instructions
4.1 Power On/Off
- Power On: Press and hold the multi-function button for 3 seconds. The blue LED will flash.
- Power Off: Press and hold the multi-function button for 3 seconds. The red LED will flash briefly before turning off.
4.2 Music Playback
- Once paired and connected, play music from your Bluetooth device. The audio will stream through the Airfrex receiver to your connected audio system.
- Dynamic Bass Boost: This feature provides an option to add flavor to your music by increasing bass or compensating for bass in your headphones, speakers, or car stereo. Refer to your device's specific controls for activation if available.
4.3 Hands-Free Calling
The integrated high-sensitivity microphone enables hands-free phone conversations without noise interruption or echo, even for car stereo systems.
- Answer Call: Short press the multi-function button when a call comes in.
- End Call: Short press the multi-function button during a call.
- Reject Call: Press and hold the multi-function button for 2 seconds when a call comes in.
- Redial Last Number: Double-press the multi-function button.
Image: An infographic summarizing key features of the Airfrex receiver, including CSR chipset, HD audio, Bass Boost, 120 mAh battery, no echoing, 33 feet range, CVC noise cancelling, and automatic shutdown.
5. Maintenance
- Keep the device dry. Avoid exposure to moisture or liquids.
- Do not disassemble the device. This will void the warranty.
- Clean the device with a soft, dry cloth. Do not use harsh chemicals or abrasive materials.
- Store the device in a cool, dry place when not in use.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Cannot pair with device | Receiver not in pairing mode; Bluetooth off on source device; too far apart. | Ensure receiver is flashing blue/red; turn on Bluetooth on source device; bring devices closer (within 33 ft). |
| No sound | Volume too low; incorrect AUX connection; receiver not paired. | Increase volume on both receiver and source device; ensure 3.5mm jack is fully inserted; re-pair the receiver. |
| Poor call quality | Interference; low battery. | Move away from sources of interference; charge the receiver fully. |
| Device automatically turns off | Bluetooth disconnected for a period; low battery. | This is a power-saving feature. Reconnect Bluetooth or charge the device. |
7. Specifications
- Model: AKU2
- Bluetooth Version: 5.3
- Connectivity Technology: AUX, Bluetooth
- Wireless Communication Standard: Bluetooth
- Special Features: Automatic shut-off, Fast charging, Low latency, Built-in microphone, Dedicated Headphone Amplifier, Dynamic Bass Boost
- Power Source: Battery powered
- Material: Aluminum
- Color: Silver
- Item Weight: 10 Grams
- Operating Range: Up to 33 feet (10 meters)
- Compatible Devices: Headphones, Speakers, Smartphone, Car stereo system, Home stereo system
Image: A diagram illustrating the Airfrex receiver's compatibility with various devices, including smartphones, music players, tablets, laptops, wired over-ear headphones, wired in-ear headphones, home theatre systems, and vehicle audio systems, all within a 33 ft (10 meters) Bluetooth range.
8. Warranty and Support
Airfrex products come with a standard manufacturer's warranty. For detailed warranty information, technical support, or customer service inquiries, please refer to the contact information provided on the product packaging or visit the official Airfrex website.
