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 through built-in microphone. Bluetooth main control chip preserves AUX audio input function through the cars existing system. Provides wireless music streaming capability, compatible with older and current car audio systems. Many users find playing music in cars inconvenient due to lack of modern input options. Without an auxiliary input, users must rely on outdated methods like burning CDs, which are slow and impractical. Many older car stereos already have a built-in but unused AUX input function. This product activates that hidden feature to enable online music playback. In todays streaming era, using online apps is convenient and content is regularly updated. Installation: - Red power cable connects to 12V+ - Black power cable connects to 12V- - Plug into the CD player jack (confirm correct socket compatibility) - Connect mobile phone to the Bluetooth module - Select AUX audio source on the car radio to play music from your phone Specifications: - Transmission Distance: 15m - Frequency Response: 20Hz20kHz - Frequency Range: 2.4022.480GHz - 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 differences in display screens may cause slight variations in color between the image and the actual item. Measurement allows an error of +/- 13cm.