The easiest way to find the serial number on your Surface Headphones or Surface Earbuds is with the Surface Audio app or Surface app.
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For Windows 10/11 PC: Select Start, then select Surface in the all apps list. Select Surface Headphones or Surface Earbuds > Device information. The serial number is listed there.
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On an iOS device or Android device: Open the Surface Audio app, select Settings next to Surface Headphones, then select About. You’ll find the serial number there.