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Print Speed Black, Best Quality 16 ppm Print Speed Color, Best Quality 4 ppm First Page Out 36 secs clor, 26 secs black Processor 133 MHz Duty Cycle, Pages Per Month 35,000 Paper Trays, Std. 4550: 2 4550N: 2 4550DN: 3 4550HDN: 3 Paper Trays, Max. 4550: 3 4550N: 3 4550DN: 3 4550HDN: 3 Input Capacity, Std. 4550 / 4550N: 400 sheets 4550DN / 4550HDN: 900 sheets Input Capacity, Max. 900 sheets Output Capacity, Std 250 sheets Output Capacity, Max 250 sheets face down, 150 sheets face up Envelope Input, Max. 10 Envelope Feeder No Duplex Printing 4550 / 45500N: Optional 4550DN / 4550HDN: Yes Media Sizes, Std Letter, legal, A4, B5 (JIS), executive. Envelopes (no. 10 common, B5 (JIS), C5, DL, and Monarch) Media Sizes, Custom 3.9 x 7.5 in to 8.5 x 14 in Media Types Paper (bond, recycled, HP Color LaserJet Soft Gloss), transparencies, labels, envelopes Media Handling/Document Finishing 4500 / 4500N: Multiple input trays, optional auto-duplexer 4500DN / 4500DN: Multiple input trays, auto-duplexer Hard Drive 4550 / 45500N / 4550DN : Optional 4550HDN: Yes, 6 GB Memory, Std. 4550 / 4550N: 64 MB 4550DN / 4550HDN: 128 Memory, Max. 256 MB Memory Slots 3 Memory Technology MEt Typefaces 135 TrueType (80 built-in) Connectivity Enhanced capabilities port (ECP) C-connector interface; Two enhanced input/output (EIO) interface slots for fast data transfer and modular expansion; HP Jetdirect 610N (EIO) print server for Fast Ethernet, Ethernet, Token Ring, and LocalTalk environments; Most major network operating systems supported with appropriate HP Jetdirect 600N (EIO) Internal print server card inserted into printer's EIO slot; Automatic network protocol switching allows printer to support more than one network operating system; A full line of third-party interfaces is also available through HP Prints Color Yes Print Quality, Black Best 600 dpi Print Quality, Color Best 600 dpi Technology, Black Print Resolution HP ImageREt 2400 Print Languages, Std. HP PCL 6 & 5C, Adobe PostScript Level 3 emulation Automatic Language Switching HP Web JetAdmin Automatic I/O Switching Yes Automatic Network Switching Yes Compatibility Windows 95, 98, Millennium Edition, NT (3.51, 4.0), 2000, XP. Macintosh OS. IBM OS/2 2.0 or later. The latest drivers are available to download from HP's web site. Dimensions : (W x D x H) 4550 / 4550N: 19.7 x 22 x 15.6 in 4500DN / 4550HDN: 19.7 x 27.9 x 22.8 in Weight 4550 / 45500N: 125 lb 4550DN / 4550HDN: 165 lb