1. Introduction
The Airfrex AIU2 Bluetooth Adapter is a versatile wireless receiver designed to bring Bluetooth connectivity to your car audio system, home stereo, or wired headphones. Featuring a Qualcomm Bluetooth chipset and a dedicated TI headphone amplifier, it delivers high-quality audio and hands-free calling capabilities. This manual provides comprehensive instructions for setting up, operating, and maintaining your AIU2 adapter.
2. Product Overview
The Airfrex AIU2 is a compact and portable device, designed for ease of use and high performance.
Image: The Airfrex AIU2 Bluetooth Adapter, a compact silver and black device with a 3.5mm audio jack, a central control button, and an LED indicator.
Key Features:
- Qualcomm Bluetooth Chipset: Ensures wide compatibility, instant pairing, and lossless audio transmission.
- Dedicated TI Headphone Amplifier: Provides enhanced sound quality with powerful bass, smooth vocals, and clear pitch.
- Built-in High Sensitivity Microphone: Enables hands-free phone calls.
- Long Range & Stable Signal: Maintains connection up to 33 feet (10 meters) without breaking up.
- Bass Boost Option: Allows for enhanced bass with a simple button press.
- CVC Noise Cancelling Technology: Reduces background noise for clearer calls.
- Automatic Re-pairing: Automatically reconnects to previously paired devices.
- Automatic Power Off: Saves power when Bluetooth is disconnected.
Image: An infographic displaying key features of the Airfrex AIU2, including Bluetooth 4.1, CSR Chipset, HD Audio, Bass Boost, 120 mAh battery (6 hours), No Echoing, 33 Feet Range, CVC Noise Cancelling, and Automatic Shutdown.
3. Setup Instructions
3.1. Charging the Device
Before first use, fully charge your Airfrex AIU2 adapter. Use the included USB charging cable to connect the adapter to a USB power source (e.g., computer USB port, USB wall adapter). The LED indicator will show charging status.
3.2. Pairing with a Bluetooth Device
- Ensure the AIU2 adapter is charged.
- Press and hold the central button on the AIU2 until the LED indicator begins to flash, indicating it is in pairing mode.
- On your Bluetooth-enabled device (smartphone, tablet, etc.), go to the Bluetooth settings and turn Bluetooth on.
- Search for available devices. The AIU2 will appear as "Airfrex AIU2" or similar.
- Select "Airfrex AIU2" to pair. Once successfully paired, the LED indicator will stop flashing and remain solid.
3.3. Connecting to Audio Systems/Headphones
After pairing, plug the 3.5mm audio jack of the AIU2 into the AUX input of your car stereo, home stereo, or directly into your wired headphones.
Image: A diagram illustrating the Airfrex AIU2's compatibility with various devices, including smartphones, wireless 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.
4. Operating Instructions
The Airfrex AIU2 features a single multi-function button for easy control.
Image: A diagram showing the Airfrex AIU2 with a hand pressing its central button, illustrating single and double press functions. Single press controls power on/off, play/pause, and call answer/end. Double press activates or cancels the bass boost feature.
4.1. Basic Functions (Single Press)
- Power On/Off: Press and hold the button for approximately 3 seconds to turn the device on or off.
- Play/Pause Music: While music is playing, a single press will pause playback. Press again to resume.
- Answer/End Call: When a call comes in, a single press will answer the call. During a call, a single press will end it.
4.2. Bass Boost Feature (Double Press)
- Activate Bass Boost: Double-press the central button to activate the bass enhancement feature.
- Cancel Bass Boost: Double-press the central button again to deactivate the bass boost feature.
4.3. Usage Scenarios
Image: The Airfrex AIU2 adapter connected to a pair of over-ear headphones, with a smartphone displaying a music player interface in the background, demonstrating its use as a powerful wireless headphone amplifier.
Image: The Airfrex AIU2 adapter connected to a pair of wired earbuds, with a smartphone displaying a music player interface, illustrating its use with in-ear headphones.
Image: The Airfrex AIU2 adapter plugged into a car's AUX input, with a smartphone resting in the console, highlighting features such as support for use while charging, built-in microphone for hands-free calls, automatic re-pairing, and automatic power-off when Bluetooth is disconnected.
5. Maintenance
5.1. Charging
The AIU2 is equipped with a 120 mAh Lithium Polymer battery. For optimal battery life, charge the device using the provided USB cable when the battery is low. Avoid extreme temperatures during charging and storage.
5.2. Cleaning
Wipe the device with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Battery is depleted. | Charge the device fully. |
| Cannot pair with Bluetooth device. | AIU2 not in pairing mode; Bluetooth on source device is off or already connected to another device. | Ensure AIU2 is flashing (pairing mode). Turn Bluetooth off and on again on your source device. Ensure no other devices are connected. |
| No sound or poor sound quality. | Volume too low; incorrect AUX input selected; loose connection; interference. | Increase volume on both AIU2 and source device. Ensure correct AUX input is selected. Check 3.5mm connection. Move away from sources of interference. |
| Short battery life. | Battery not fully charged; aging battery. | Ensure full charge before use. Battery life may decrease over time. |
| Hands-free calls are unclear. | Microphone obstructed; excessive background noise. | Ensure microphone is clear. Utilize CVC Noise Cancelling feature. Reduce background noise if possible. |
7. Specifications
- Model Number: AIU2
- Product Dimensions: 0.59 x 0.47 x 2.36 inches
- Item Weight: 0.353 ounces
- Batteries: 1 Lithium Polymer battery (included)
- Connectivity Technology: Bluetooth
- Special Features: Automatic On/Off, Built-In Microphone, Hands-Free Calls, Low Latency, Noise Cancellation, Bass Boost
- Audio Jack: 3.5mm Jack
- Color: Silver
- Material: Metal, Plastic
- Bluetooth Range: Up to 33 feet (10 meters)
8. Warranty and Support
For warranty information and technical support, please refer to the contact details provided with your purchase or visit the official Airfrex website. Keep your proof of purchase for any warranty claims.
Image: The Airfrex AIU2 adapter in its gift-box packaging, alongside its included accessories: a 3.5mm female to female adapter, a USB charging cable, and the user manual.
