# DesktopCapturerSource Object

* `id` String - The identifier of a window or screen that can be used as a
  `chromeMediaSourceId` constraint when calling
  [`navigator.webkitGetUserMedia`]. The format of the identifier will be
  `window:XX` or `screen:XX`, where `XX` is a random generated number.
* `name` String - A screen source will be named either `Entire Screen` or
  `Screen <index>`, while the name of a window source will match the window
  title.
* `thumbnail` [NativeImage](../native-image.md) - A thumbnail image. **Note:**
  There is no guarantee that the size of the thumbnail is the same as the
  `thumbnailSize` specified in the `options` passed to
  `desktopCapturer.getSources`. The actual size depends on the scale of the
  screen or window.