About the sound your MacBook, MacBook Air, or MacBook Pro makes when you plug it in

Mac notebook computers with a USB-C port or Thunderbolt 3 (USB-C) port make a tone when you connect them to power. This lets you know that your computer recognized the power adapter.

If your Mac is turned off when you connect the adapter, your keyboard and trackpad won’t become active until after you hear the tone. After the tone, you can press the power key or the Touch ID button to power up your Mac.

It's best to use the Apple AC power adapter that came with your computer.

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