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So, i've owned this 19 Macbook air for roughly 15 months and along with it i bought the USB C adapter Only now, recently i've come across a very alarming and annoying sound Ringing from the USB C port itself once it connects to the power source ie the MacbookAs you've probably guessed, either from the above image or common knowledge, the Apple USBC digital AV multiport adapter is basic as fuck, bearing a mere trio of connections a USBC port youThe USBC Digital AV Multiport Adapter lets you connect your USBCenabled Mac or iPad Pro to an HDMI display, while also connecting a standard USB device and a USBC charging cable This adapter allows you to mirror your Mac or iPad Pro display to your HDMIenabled TV or display in up to 1080p at 60Hz or UHD (3840 by 2160) at 30Hz Apple Usb C Digital Av Multiport Adapter Apple usb c digital av multiport adapter power delivery