This BlendMount Kit includes everything needed for a professional looking installation, including extension cable and inline coupler. BlendMount is compatible with rear view mirrors that have a cylindrical-shaped stem between the mirror and the windshield, or a chili-pepper-shaped stem common in Toyota vehicles. BlendMount is not compatible with rear view mirrors that don't have these stems. (ScanGauge II 3-in-1 Auto Computer and Rear View Mirror NOT included.)