Audio receiver UGREEN CM309 Bluetooth 5.0 USB with 3.5 mm AUX jack, black, 20–20000 Hz

UGREEN CM309 Bluetooth 5.0 receiver (Ugreen-70601B) is a compact audio adapter with USB power and a 3.5 mm AUX output that enables wireless audio streaming from smartphones, tablets or laptops to wired speakers, car stereos or amplifiers. The device supports Bluetooth 5.0, has an LED status indicator and is designed to add hands‑free calling and wireless playback to equipment without native Bluetooth.

Advantages

The UGREEN CM309 provides a stable Bluetooth 5.0 connection with up to 10 m range and supports simultaneous pairing of two devices. It includes a built‑in microphone for hands‑free calls and an LED indicator that shows power, pairing and call/music status. The receiver is compatible with a wide range of wired audio equipment and uses durable TPE cabling and twisted construction for improved longevity and transmission stability.

Suitable for

• Adding Bluetooth streaming to car stereos
• Connecting smartphones or tablets to wired speakers or amplifiers
• Hands‑free calling in vehicles or at a desktop audio setup
• Turning traditional speakers or headphones into wireless playback devices

Key specifications

• Manufacturer: UGREEN
• Model / Bluetooth name: Ugreen-70601B (CM309)
• Bluetooth version: 5.0
• Frequency response: 20 Hz – 20 kHz
• Sensitivity: 94 dB
• LED indicators: red and blue
• Interfaces: USB (power) and 3.5 mm AUX output
• Color: Gray

How to use

Connect the receiver's USB plug to a power source and plug the 3.5 mm AUX connector into the AUX input of your car stereo, amplifier or speaker. Turn on the UGREEN CM309, enable Bluetooth on your phone or other device and select Ugreen-70601B from the list of available devices. After pairing, play audio on the source device; use the built‑in microphone for hands‑free calls when a call arrives.

Recommendations

For best performance, keep the transmitting device within 10 meters and avoid obstacles between devices. Use the receiver with a stable USB power source and insert the AUX plug firmly to ensure reliable audio output. If pairing issues occur, turn Bluetooth off and on again on the source device and restart the receiver.