Please note that this adapter can only be used for usb-a at one end and usb-c at the other end. It can't be used for usb-c at both ends. It can charge and transmit data, but it can't be used for headphones. [ Charging and Data Sync]: Can be used both charging and Data Sync. Supports Data Sync only for iPhone to Computer Data. Does Not Support OTG HDMI & Audio(which means Mouse, Keyboard, Card Reader, U Disk, Flash Drive, External Hard Drives, Neither video nor audio). [USB-C to Lightning Adapter]: An ideal solution to charge and sync iOS devices by a USB-C cable, saving the trouble of carrying extra cable around. Directly makes iOS devices compatible with USB-C cable. Enables your iPhone & iPad machine to connect a USB-C cable. Minimum design, no additional drivers or installation required. WIDE COMPATIBILITY: The Lightning OTG Adapter Support for iOS 13 and Later, Compatible with iPhone 11 12 Pro Max / Xs / Xs Max / X / 8/8 Plus / 7 / 7Plus / 6/6 Plus / 5 / 5S / SE and iPad Air / Mini / Pro etc Lightning Electronic equipment. [Hussle Free In-Case Charging]The minimum size of the output 8-pin end design is slim enough to compatible with most of waterproof cases. Just plug and charge without removing the iPhone iPad case.