1. Product Overview
The UGREEN Bluetooth 5.3 Audio Receiver is designed to add wireless audio streaming capabilities to your car or home stereo systems. It features Bluetooth 5.3 for stable connections, hands-free calling with a built-in microphone, and high-fidelity sound quality.
Key Features:
- Bluetooth 5.3: Ensures stable and efficient wireless connection.
- Hands-Free Calling: Built-in microphone for safe communication while driving.
- Hi-Fi Sound Quality: Supports SBC/AAC high-definition decoding for clear and delicate audio.
- Dual Device Connection: Connects to two devices simultaneously.
- Auto Reconnection: Automatically pairs with the last connected device.
- Wide Compatibility: Works with car audio systems, home speakers, headphones, and more.
- Noise Reduction: Integrated power isolation module filters interference and reduces noise.
2. Setup Guide
Follow these simple steps to set up your UGREEN Bluetooth Audio Receiver:
- Plug into Power and Audio: Insert the USB-A end of the receiver into a USB power source (e.g., car USB port, USB charger) and the 3.5mm AUX jack into your audio system's AUX input.
- Turn on Bluetooth: Enable Bluetooth on your smartphone or other audio device.
- Pair Device: Search for "UGREEN-70601" in your device's Bluetooth settings and connect.
- Enjoy Wireless Music: Once connected, you can stream audio wirelessly.
3. Operating Instructions
3.1 Hands-Free Calling & Navigation
The receiver features a built-in microphone, allowing you to make and receive calls safely while driving. It also supports voice navigation prompts through your car's audio system.
3.2 Multi-Device Connection
You can connect up to two devices to the receiver simultaneously. This allows you to seamlessly switch between music playback from one device and answer calls from another without re-pairing.
3.3 LED Indicator States
The LED light on the receiver provides visual feedback on its current status:
| LED States | Flash Frequency | Working Status |
|---|---|---|
| Blue light | Stays blue, then flashes twice every second | Power On |
| Blue light | Flashes twice every second | Pairing |
| Blue light | Flashes once every 10 seconds | Connected |
| Blue light | Flashes once every 10 seconds | Reconnected |
| Blue light | Flashes twice every second | Disconnected |
| Blue light | Flashes twice quickly every 10 seconds | Play Music |
| Blue light | Flashes once every 10 seconds | Pause Music |
| Blue light | Flashes once every 3 seconds | Phone Call |
4. Maintenance
To ensure the longevity and optimal performance of your UGREEN Bluetooth Audio Receiver, please follow these general maintenance guidelines:
- Keep the device dry and away from moisture.
- Avoid extreme temperatures.
- Clean the device with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners.
- Store the device in a safe place when not in use to prevent physical damage.
5. Troubleshooting
5.1 Device Does Not Connect Automatically
- Ensure your phone's Bluetooth is enabled before starting your car or powering on the receiver.
- The device should automatically reconnect to the last paired phone. If not, manually select "UGREEN-70601" from your phone's Bluetooth settings.
5.2 Poor Sound Quality or Background Noise
- The receiver has a built-in high-performance power isolation module to reduce noise. If you experience static or humming, try connecting the USB power to a different source (e.g., a dedicated USB charger instead of a car's built-in USB port or cigarette lighter adapter).
- Adjust the volume levels on both your phone and your audio system. Sometimes, setting the phone volume too high can introduce distortion.
5.3 Power Interruption
- If the device frequently loses power, try using a different USB power source or cable to rule out issues with the power supply.
5.4 Cannot Connect to a Specific Device
- If the receiver is connected to an unintended device, you may need to disable Bluetooth on that device or manually disconnect it. The receiver does not have a physical reset button, so managing connections from your phone is key.
6. Specifications
| Attribute | Value |
|---|---|
| Brand Name | UGREEN |
| Model Number | CM309 (70601) |
| Product Name | Bluetooth Receiver / USB Bluetooth Adapter / Bluetooth Aux Adapter / Bluetooth for Car / Bluetooth Car Adapter |
| Bluetooth Version | 5.3 |
| Bluetooth Protocol | A2DP, HFP |
| Transmission Distance | 10 meters |
| Audio Encoding Technology | SBC, AAC |
| SNR | 94dB |
| Microphone Sensitivity | 42±3dB |
| Operating Frequency | 2.400GHz-2.4835GHz |
| Audio Sample Rate | 3.5mm audio port: 16bits, 44.1K/48KHz; Microphone: 16bits, 8KHz. |
| Response Frequency | 20-20KHz |
| Cable Length | 0.3m-1.5m (TPE wire, retractable) |
| Shell Material | Zinc alloy metal shell |
| Functions | Built-in microphone, Stereo Sound / CD Sound Quality, Connect 2 devices at one time, Auto reconnection, Support call function, Support power on automatically, Built-in high-performance power isolation module, Indicator light. |
| Certification | CE, FCC, IC, UKCA, SRRC, ICES, TELEC |
| Package Dimensions (L x W x H) | 10 cm x 6 cm x 3 cm |
| Package Weight | 0.12 kg |
7. User Tips
- Automatic Connection: For seamless auto-reconnection in your car, ensure your phone's Bluetooth is active before you start the vehicle.
- Sound Quality Optimization: If you notice any distortion or background noise, try adjusting the volume on both your phone and your car stereo. Experiment with different USB power sources if the issue persists.
- Versatile Use: This adapter is not just for cars! It can transform any old stereo system or wired headphones into Bluetooth-enabled devices, provided they have a 3.5mm AUX input and a USB port for power.
- Hands-Free Calls: The built-in microphone is designed for clear communication. If call quality is an issue, ensure the microphone is not obstructed and you are within optimal range.
8. Warranty and Support
UGREEN products are designed and manufactured to the highest quality standards. For detailed warranty information and customer support, please refer to the official UGREEN website or the included user manual PDF.
A digital version of the user manual is available here: UGREEN Bluetooth Audio Receiver User Manual (PDF)