. Brief Product Introduction The module helps you play the music stored on the Bluetooth device on the radio through wireless transmission, which solves the problem that due to the lack of reserved audio input ports and inconvenience in the use of signal cables in the car stereo. Note 1.Please confirm whetherthe stereo contains AUX or addtional criginal interface before purchasing.You can contact our staff to ask more details about the module or take the electronic manual,thank you! 2. This module typedoesn"'"t support hands-free phone call :It doesn"'"t supports answer/hang up etc via car radio buttons and steering wheel buttons 3. This moduledoesn"'"t support for bluetooth AVRCP Control :It can not via car radio buttons or steering wheel buttons to Prev/Next Track,Pause/Play,Fast forward/backward. Feature 1. Plug & Play:installed via original CD changer port, easy and fast, perfectly integrated with the car. 2. Wireless A2DP Playback:easily streaming music of for bluetooth devices into factory car stereo system. 3. Hifi Sound Quality:Connected to car stereo via wire harness,no interference and no loss of sound quality,rivaling original CD sound. 4. Allow you to easily have popular configuration of advanced car stereo,is the best choice for safe driving and enjoying digital music.Specification Voltage Input:4.5V ~14.6V DCOperational Current:600mA Standby Current:20mA DAC Resolution:20bit Total Harmonic Distortion:0.05%SN Ratio:90dB Frequency Response:20HZ-20KHZ. Compatible models Applicable models for: For BMW E90 E91 E92 E93 2003 onward Very Important!!!(Please make sure you have opened the AUX function) Fits for Head Units as the follows: for 609 (navigation system)for SA 650 (Business radio with CD drive) for SA 661 (Business radio with CD drive)for SA 662 (Business radio). Package Included 1x for bluetooth aux cable When you place an order, please choose a