The RENA Envelope Imager 4.0 The RENA Envelope Imager 4.0 RENA’S Newest High-Speed Tabletop Inkjet Envelope Imaging System Prints 34,000 postcards per hour @ 200 dpi! 4” Print Area From Full Independent Heads 64 MB Ram, USB Interface, 133 Mhz Processor Innovative Spotless Transport Rollers Eight Print Qualities Thickness Capability of 3/8” The  Sharpest, Highest Print Quality To Date! Specifications Speed Rating   Postcards 34,000/hr #10 Envelopes 26,000/hr Material Size:   Width 5" - 17" Length 3" - 13.5" Maximum Material Thickness 3/8" DPI Range 150 DPI to 600 DPI Print Heads 8 Banks of Heads 4 (3,3,1,1) Print Area 4" Internal Printer Memory 64 MB Cartridge Storage Station Yes Duty Cycle 2,000,000 per Month Printer Life 120 Million Address Interface USB 2.0 & Centronics Parallel Dimensions   LxWxH; Weight 25" x 28" x 22"; 80 lbs.