Opened once to test the connection. I tried several times, but either the connection method was incorrect, or while the power turned on, it wasn't recognized by my car (TOYOTA PRADO 150) and I couldn't use it. An instruction manual is included, and you can also watch the connection method on YouTube by scanning the QR code. Someone familiar with cars might be able to use it, but there's no guarantee it will be recognized by all car audio systems. Therefore, please understand this before purchasing. Just in case, I'll quote the precautions from the product page where I purchased this item: "Please confirm that your car is equipped with OEM CarPlay. This product is suitable for 98% of cars with wired CarPlay. Not compatible with Mercedes-Benz original car players from 2016 to 2025, all BMW series, Tesla, and some models."