Features: Pair your phone or pad with the bluetooth compatible module. And select Aux from your radio, then you can use your phone to play music through your car speakers. This bluetooth compatible music adapter 4.0 is a plug-and-play wireless bluetooth compatible music adapter. Function keys, mode button, press the bluetooth compatible mode, press again to U-Disk mode. Indicator light, bluetooth compatible mode, blue lights are on. If not paired, the blue light often flickers, and if the pairing is successful, the blue light is always on. USB interface, in U-Disk mode, Red light is always on, insert the U-Disk and wait for the time to be read off about 10 seconds. Specifications: Material: Plastic Length: About 42cm/16.53inch Operating Voltage: 5V Working Current: 25-50mA Bluetooth Compatible Version: Bluetooth Compatible 4.0 (Supports Backward Compatibility) Transmission Frequency: 2.4-4.8GHz Signal to Noise Ratio: 75dB Connector: USB/3.5mm - AUX, USB Cable Fitment: Fits Mini Cooper (For reference only.) Note: . Please allow 1-2cm error due to manual measurement, make sure you do not mind before ordering. . Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understanding. Package Includes: 1x Audio Input Cable