HP DeskJet and Photosmart Auto-Duplex Unit C6463A Automatic duplexing - no manual flipping of pages. Paper Capacity: up to 100 sheets or 20 cards. Max. Document Size: sheets-8.5x11in., cards-5x8in. Supported Media: plain paper, HP Bright White Inkjet Paper, HP Premium Inkjet Heavyweight Paper, HP Felt-textured Greeting Cards, HP Greeting Card Paper, HP Professional Brochure and Flyer Paper (glossy or matte). Quick installation - easily snaps on the back of the printer. Quiet operation and compact design. The following is a list of compatible machines: DeskJet 930C, 932C, 935C, 940C, 950C, 952C, 960C, 990c, 995c OfficeJet G55, G55xi, G85, G85xi PhotoSmart P1000, P1100, 1000, 1115, 1215, 1218, 1315