This device enables wireless CarPlay. By plugging it into your vehicle's USB port and connecting your smartphone via Bluetooth, you can make wired CarPlay wireless. It is compatible with vehicles and audio systems that support wired CarPlay. The size is about the size of a 10-yen coin. It has been opened for connection testing, but is essentially unused. - Type: Wireless USB Adapter - Product Name: Wireless CarPlay - Accessories: User Manual - Port: USB Port Thank you for viewing.