Function VIA Bluetooth-enabled Devices. Only fit for Alpine. No functional limitations of the car radio. Allows you to connect an external audio source. It is possible from your smart phone to your car stereo to stream. And pair your phone with our Bluetooth module,and choose Aux from your radio. You can enjoy music from your phone through car speakers Work with iPod/for iPad/iPhone 5/5C/5S/6/6 plus/Samsung/HTC/Sony/Nokia and any other phones or pads Bluetooth 4.0 version, and compatible with 2.0 3.0 4.0 other versions of Bluetooth, can support the commonly used MP3 format audio, but also support the WMA/WAV/FLAC, and other high-quality audio format decoding, non-ordinary Bluetooth functions, can support DSD large capacity transmission Very easy installation. Installation method: Red power cable connected to 12V+ Black power cable connected to 12V- Bluetooth module connector: 12V Cable length: 20cm(Approx.) Colour: Black Material: Plastic Package Contents: 1 x Bluetooth AUX audio cable (with OPP bag) Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.