This is an electronic control unit (ECU, "brain box") for a Motorola T605 music and handsfree carkit - part number SYN1782A. Use this ECU to replace a damaged one in your vehicle, or to start fresh on an install to move your T605 bluetooth carkit into another vehicle. I also have other parts for the T605 (UIM/buttons, power harness, handsfree and aux input adapters) available in my booth. This ECU has been updated with SW version 0.6.11, which is from the later SYN1782B version of the T605 ECU. It has been tested and is working. I have a mobile electronics installation business and use my Bonanza booth to sell off excess inventory. Please feel free to send a message if you have further questions about any of my items or a question about a handsfree or aux input adapter harness for your specific vehicle. Thanks for looking!