Introduction
The Belkin Hands-Free Bluetooth CarAudio Connect Aux provides an in-car solution for making calls and streaming music from a smartphone through your vehicle's stereo system. This device enables hands-free communication and audio playback, routing both calls and music through your car's speakers for enhanced sound quality.

Image: The Belkin Hands-Free Bluetooth CarAudio Connect Aux, showing the main control button, the Micro CLA power adapter with USB port, and the Aux-In connection cable.
What's in the Box
Verify that all components are present in the package:
- Hands-Free Bluetooth CarAudio Connect Aux (main control button with integrated microphone)
- Micro CLA Power Adapter with USB Power Port
- Aux-In Connection Cable
Safety Information
For safe operation and to prevent potential hazards, please observe the following guidelines:
- Do not attempt to adjust the device or its settings while operating a vehicle.
- Ensure the device is positioned in a location that does not obstruct your view of the road or interfere with vehicle controls.
- Protect the device from extreme temperatures, direct sunlight, and moisture.
Setup Instructions
1. Physical Connection
- Connect the Aux-In Cable: Plug the 3.5mm audio jack from the Belkin device into your car's auxiliary input port.
- Connect the Power Adapter: Insert the Micro CLA power adapter into your vehicle's 12V accessory outlet (cigarette lighter socket).
- Mount the Control Button: Secure the control button to a convenient location on your dashboard using the adhesive backing or magnetic mount. Ensure it is within easy reach and does not obstruct driving. The button also contains the microphone for hands-free calls.

Image: Connecting the Micro CLA power adapter to the car's 12V accessory outlet.

Image: Positioning the Belkin control button on the dashboard.
2. Bluetooth Pairing
- Ensure your vehicle's ignition is on, providing power to the adapter. The control button should illuminate with an orange light.
- Press and hold the control button for several seconds until the light begins to blink blue. This indicates the device is in pairing mode.
- On your smartphone, navigate to the Bluetooth settings and enable Bluetooth.
- Select "Belkin CarAudio Connect" (or similar name) from the list of available devices.
- Once paired, the control button's light will turn solid blue. No PIN is typically required.
Video: An overview of the Belkin Hands-Free Bluetooth CarAudio Connect Aux, demonstrating its installation and basic functionality within a car environment.
Operating Instructions
Music Playback
- Start/Resume Music: After pairing, select your audio content on your smartphone. The audio will play through your car stereo. If paused, briefly press the control button to resume playback.
- Pause Music: Briefly press the control button once to pause playback.
- Skip Track: Double-press the control button to skip to the next track.
- The device will automatically reconnect to your paired smartphone when the car is started and the button is pressed.
Hands-Free Calling
- Answer Call: When an incoming call is received, your music will automatically fade. Briefly press the control button once to answer the call.
- End Call: Briefly press the control button once to end an active call.
- Voice Commands: Press and hold the control button to activate your smartphone's voice assistant (e.g., Siri, Google Assistant) for voice dialing or other commands.

Image: Demonstrating an incoming call handled by the Belkin device in a car.
Maintenance
To ensure the longevity and optimal performance of your Belkin CarAudio Connect Aux:
- Keep the device clean by wiping it with a soft, dry cloth. Avoid using harsh chemicals or abrasive cleaners.
- Ensure all connections are secure and free from debris.
- Store the device in a cool, dry place when not in use for extended periods.
Troubleshooting
| Problem | Solution |
|---|---|
| No Power/Light Off | Ensure the Micro CLA power adapter is securely plugged into the 12V accessory outlet and the vehicle's ignition is on. Check the vehicle's fuse for the 12V outlet if necessary. |
| Cannot Pair Device | Ensure the Belkin device is in pairing mode (blinking blue light). Turn off and on your smartphone's Bluetooth. Try restarting both the Belkin device (by unplugging and replugging) and your smartphone. Ensure no other devices are actively connected to the Belkin unit. |
| No Audio Output | Verify the 3.5mm Aux-In cable is fully inserted into both the Belkin device and your car's auxiliary input. Ensure your car stereo is set to the AUX input source. Check the volume levels on both your smartphone and car stereo. |
| Poor Call Quality | Ensure the control button (microphone) is positioned clearly, away from obstructions or excessive noise sources like air vents. Adjust the volume on your car stereo. |
| Device Disconnects Frequently | Ensure your smartphone is within close proximity to the Belkin device. Avoid placing large metal objects between the device and your phone. Try re-pairing the device. |
Specifications
| Feature | Detail |
|---|---|
| Model Number | F4U037bt |
| Connectivity Technology | Bluetooth, Auxiliary |
| Wireless Communication | Bluetooth |
| Special Features | Hands-Free Calls, Echo Cancelling Microphone, Seamless switching between calls and music |
| Human Interface Input | Microphone |
| Power Source | Corded Electric (via 12V accessory outlet) |
| Color | Black |
| Product Dimensions | 1.4 x 6 x 5.6 inches |
| Item Weight | 4.5 ounces (approx. 127.57 grams) |
| Manufacturer | Belkin |
Warranty and Support
This product is subject to Belkin's standard warranty terms and conditions. For detailed warranty information, please refer to the official Belkin website or contact Belkin customer support.
Legal Disclaimer: This product is non-refundable as per the provided information. Please review the return policy of your retailer at the time of purchase.
For further assistance or technical support, please visit the official Belkin support page or contact their customer service.





