If it has both types, then it gets Flatbed + ADF. If it has an ADF only, it gets ADF as the result. The results are pretty straightforward: If the printer has a flatbed scanner only, it gets "Flatbed" as the result. This means that instead of having to place each page of a document on the scanner yourself, you just set them all in the input tray, hit start, and the ADF handles the rest. On the other hand, an ADF automatically feeds through multiple sheets of paper into the sheetfed scanner, and the document is ejected once it's done scanning. Since there's usually space for only one sheet on the glass, you can only do one scan at a time. You place the document you'd like to scan on top of the flatbed, and the scan head moves beneath the glass to capture your document. Just like the name suggests, a flatbed scanner has a scan head placed underneath a flatbed of glass or clear plastic. If you want to scan delicate documents like photographs or old letters, or thicker objects like ID cards, passports, or books, then you need a flatbed scanner.
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