Features: Combine your phone or pad with the bluetooth-compatible module. And choose Aux from your radio, then you can use your phone to for 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 it is not paired, the Blue light is often flicker and if pairing is successful, the blue light is always-on. USB-interface, in the U-Disk mode, Red light is always-bright, insert the U-Disk, waiting for the-time to read about 10 seconds. Specifications: Material:Plastic Length:Approx.42cm/16.53inch Operating voltage: 5V Working current: 25-50mA Bluetooth-compatibl version: Bluetooth-compatible 4.0 (supporting backwards compatibility) Transmission frequency: 2.4-4.8GHz Signal to noise ratio: 75dB Connector: USB/3.5mm - AUX, USB Cable Fitment : fit Mini Cooper ( just for reference.) Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Audio Input Cable