Q:Can you explain the difference in the usb options? A: Using the optional USB harness will allow you to reuse the factory USB port for Carplay/Android Auto. Without it, you will have an additional USB port that you will have to route from behind the radio to the area you desire. Q: Will Siri be triggered by wheel controls? A: Unfortunately Siri will not be triggered by wheel controls Q: How is the video image quality? A: Video image quality is limited to factory Toyota's backup camera screen resolution which is not the best. The picture image will not be HD. This has been the biggest reason for RMA returns. Q: Will this unit receive regular apple carplay updates like stock units? A: The actual update is being done on your phone and will reflect on device when you use it. Q: Does this unit support other languages? A: The language setting is controlled by your phone. Depending on the language being used on the phone, will display on the screen.