Product Information for Volume Bracket 0 - 10,000 Copies / Month 0 - 25 Copies / Minute     Model #                                     Description     DP-2010E Up to 20-PPM WORKiO® MFP Copier/Printer/Scanner Main Unit which includes: Two, 550-sheet Paper Feed Drawers Stackless Duplex GDI Printing through parallel port TWAIN-based scanning Panasonic Document Management System software (P-DMS)     DP-2310  Up to 23-PPM WORKiO® MFP - Copier/Network Printer Main Unit which includes: Standard 50-sheet, 23-cpm Inverting Automatic Document Feeder (I-ADF) Duplexing, USB Port, and Drum standard 2 x 550 Sheet Paper Trays plus 50-sheet Bypass 10Base-T/100Base-TX Ethernet Network Interface Windows Printing System Panasonic Document Management System software