Features: Use car's AUX signal for HD audio transmission. Functions with Bluetooth-enabled devices. Bluetooth 5.0 technology helps reduce cable clutter. No functional limitations on the car radio. Allows connection of an external audio source. Integrated intelligent voice noise reduction technology to minimize background noise. The product uses digital audio processing to deliver high-fidelity sound quality. Enables clear phone call接听 through built-in microphone. Equipped with a Bluetooth main control chip, it retains the AUX audio input function through the car’s existing system. Provides wireless music streaming for both older and newer car audio systems. Many users find playing music in cars inconvenient due to lack of input ports, requiring disc burning or outdated methods. This device leverages the hidden AUX input function commonly available in older stereos, enabling online music playback via streaming apps, which offer timely updates and convenience. Installation: Red power cable connects to 12V+ Black power cable connects to 12V- Plug into the CD player jack (confirm compatible socket), pair mobile phone with the Bluetooth module, select AUX audio source to play music from your phone. Specifications: Transmitter Distance: 15m Frequency Response: 20Hz - 20kHz Frequency Range: 2.402 - 2.480GHz Distortion Rate: ≤1% Current: 20mAh Bluetooth Name: JieRi-BT 5908 Bluetooth Version: 5.0 Product Voltage: 12V Microphone Cable Length: 150cm Compatible Models: KCM-123B, M-BUS, 9501, 9503, 9823, 9825 Name: Audio Cable Adapter Color: Black Material: ABS Package Contents: 1 x Audio Cable Adapter 1 x Bluetooth Microphone Note: Light reflection and screen differences may cause slight color variation between image and actual item. Measurement error allowed within +/- 1-3cm.