1. Introduction
Thank you for purchasing the UGREEN USB 3.5mm Bluetooth 5.4 Receiver. This device allows you to wirelessly stream audio from your Bluetooth-enabled devices to your car stereo or non-Bluetooth speakers, providing a convenient hands-free calling and high-fidelity music experience. This manual will guide you through the setup, operation, and maintenance of your new receiver.
Image: UGREEN USB 3.5mm Bluetooth 5.4 Receiver with USB-A and 3.5mm audio connectors.
2. Package Contents
Please check the package for the following items:
- UGREEN USB 3.5mm Bluetooth 5.4 Receiver (Model: CM723)
- Adhesive patch (pre-attached or separate)
- User Manual (PDF available for download: User manual (PDF))
Image: Retail packaging of the UGREEN Bluetooth Receiver Audio Adapter.
3. Product Overview
The UGREEN Bluetooth Receiver features independent control buttons for safer driving and an enhanced microphone for clearer calls.
Image: Diagram showing the Multi-function Button, Indicator, Microphone, USB-A Connector (for power supply), and 3.5mm Audio Connector.
Key Features:
- Bluetooth 5.4: Provides a faster, more stable, and smarter connection with less sound quality loss.
- Independent Control Buttons: For answering/hanging up calls, playing/pausing music, and skipping tracks.
- Enhanced Microphone: Equipped with a microphone to collect your voice 360° for smoother, clearer calls with noise reduction.
- Dual Connection: Allows connection to two devices simultaneously, enabling music playback without missing calls.
- Plug and Play: Automatically turns on and pairs when the car starts.
- RGB Colorful Lighting Design: LED lights make it easier to find buttons when night falls and create a sense of atmosphere in the car.
Image: Visual representation of Independent Control Buttons, Latest Bluetooth 5.4, Enhanced Mic, and Hands-Free Calling features.
4. Setup Instructions
4.1. Installing the Receiver
- Stick the patch: Peel off the adhesive tape on one side of the patch, then stick it firmly to the back of the receiver.
- Stick the receiver: Peel off the tape on the other side and stick the receiver in a desired location in your car (such as dashboard, instrument panel, air vents, and more). Please DO NOT stick it to a metal surface. Then, press the receiver to ensure a firm adhesive grip.
Image: Visual guide for installing the receiver using the adhesive patch.
4.2. Connecting the Receiver
- Power Supply: Plug the USB-A connector into a USB power source (e.g., car USB port, USB charger). The receiver will automatically turn on.
- Audio Connection: Plug the 3.5mm audio connector into your car's AUX input or a non-Bluetooth speaker's audio input.
- Bluetooth Pairing:
- Enable Bluetooth on your mobile device (phone, tablet, etc.).
- Search for Bluetooth devices and select "UGREEN-CM723" from the list to pair.
- Once paired, the indicator light on the receiver will confirm the connection.
Image: Step-by-step guide for connecting the receiver to power and pairing via Bluetooth.
The device supports dual connection, allowing you to connect two Bluetooth devices simultaneously.
Image: Illustration of the dual connection capability, showing two phones connected to the receiver.
5. Operating Instructions
5.1. Music Playback
- Play/Pause: Press the center Multi-function Button once.
- Next Track: Press the 'Next' button (right arrow) once.
- Previous Track: Press the 'Previous' button (left arrow) once.
- Volume Up: Press the '+' button.
- Volume Down: Press the '-' button.
Image: Diagram illustrating the independent control buttons for calls and music playback.
5.2. Hands-Free Calling
- Answer/End Call: Press the center Multi-function Button once.
- Reject Call: Press and hold the center Multi-function Button for 2 seconds.
- Auto Reconnect: The receiver will automatically reconnect to the last paired device when powered on.
Image: Visual highlighting the 360-degree voice collection microphone for clearer calls.
5.3. Power On/Off
The device is designed for 'Plug and Play' operation, automatically turning on and pairing when the car starts.
Image: Illustration of the receiver automatically connecting when the car starts.
6. Specifications
| Feature | Detail |
|---|---|
| Model | CM723 |
| Product Name | Bluetooth Car Receiver |
| Bluetooth Version | 5.4 |
| Wireless Type | Bluetooth |
| Frequency Band | 2400MHz-2483.5MHz |
| Max. RF Output Power | 4dBm (EIRP) |
| Transmission Distance | 10m/33ft (no blocking) |
| Bluetooth Profile | A2DP/AVRCP/HSP/HFP |
| Codecs | SBC |
| Frequency Response | 20Hz-20kHz |
| Output Level | ≤630mV rms RL=100kΩ |
| SNR | ≥90dB A-wt. |
| THD+N | ≤0.1% |
| Mic Sensitivity | -42±2dB (0dB=1V/Pa) |
| Audio Port | 3.5mm |
| Power Supply Port | USB-A |
| Content | AUDIO |
| Package | Yes |
Image: Detailed product specifications for the UGREEN Bluetooth Car Receiver.
7. Troubleshooting
- No Power: Ensure the USB-A connector is securely plugged into a working USB power source.
- No Audio: Check if the 3.5mm audio connector is fully inserted into the AUX input. Verify your car stereo or speaker is set to the correct AUX input mode. Ensure your phone's volume is up.
- Cannot Pair: Make sure Bluetooth is enabled on your device and the receiver is powered on. Try restarting both the receiver and your Bluetooth device. Ensure no other devices are currently connected to the receiver.
- Poor Call Quality: Ensure the microphone is not obstructed and is positioned as close to you as possible. External noise can affect call clarity.
- Intermittent Connection: Ensure the receiver is within the 10m/33ft transmission distance from your Bluetooth device without significant obstructions.
8. User Tips
- Microphone Placement: For the clearest call quality, position the receiver's microphone as close to your mouth as possible. If mounted on the dashboard, you might need to speak directly towards it.
- RGB Lighting: The RGB lighting primarily indicates connection status. It may not remain lit during continuous use, which is normal operation.
- Power Off/On: To manually turn off the light and music, press and hold the center Multi-function Button for approximately 5 seconds. Repeat to turn it back on.
- Sound Quality: Many users report excellent sound quality, often a significant improvement over older Bluetooth adapters. Ensure your car's audio system settings are optimized for the best experience.
- Adhesive: The included double-sided adhesive patch provides a secure mounting solution. Ensure the surface is clean and dry before application for best adhesion.
9. Maintenance
- Keep the device dry and away from moisture.
- Do not expose the device to extreme temperatures.
- Clean the device with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners.
- Avoid dropping or subjecting the device to strong impacts.
10. Warranty and Support
UGREEN products come with a standard warranty. For detailed warranty information, technical support, or customer service, please refer to the official UGREEN website or contact your local distributor. Please retain your proof of purchase for warranty claims.