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SpecificationBrotherDS-640eBrotherDS-635e
Automatic duplex outputOptionalSource OptionalSource
Declared print speed16 ipm or mppmSource 16 ipm or mppmSource
Default sleep delay10 minSource 10 minSource
ENERGY STAR partnerBrother Industries, Ltd.Source Brother Industries, Ltd.Source
Marking technologyN/A (Scanner)Source N/A (Scanner)Source
Page format classStandardSource StandardSource
Product typeScannersSource ScannersSource
Sleep-mode power1.2 WSource 1.2 WSource
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