Windows 10 build 10240 was the final release-to-manufacturing build of Microsoft's operating system in 2015, the version that preceded the public launch later that July. Its generic system notification sound came from the standard set of Windows alerts used for messages, calendar reminders and other system events. After the operating system reached millions of computers, the chime became instantly familiar to everyday users. It later spread to soundboards and editing libraries, where creators reuse it as shorthand for a computer notification, even on devices that no longer run Windows 10.
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The generic system notification chime from Windows 10 build 10240, the final pre-release build, used in videos and memes to signal a new message or alert.
The Windows 10 notification sound is a short, clean system chime designed to catch attention without interrupting work. It opens with a soft, rounded tone that rises slightly before settling, giving it a calm, modern feel rather than a harsh alarm. At just over three seconds, it is long enough to be noticed in a video but short enough to sit under dialogue or gameplay. Viewers instantly recognise it as a computer alert, so it creates a small jolt of expectation, as if a message, update or important notice has just arrived on screen.
