HP ScanJet Pro 4200 s1 Sheetfed Scanner (8Q4W2A) - Scan Size: A4, Scanner Type: Sheetfed, Resolution: up to 600 x 600 dpi, Scan Speed: Up to 40 ppm, Memory: 512MB, Duplex Scanning: Yes, Connectivity: High Speed USB 3.0, Paper Handling: 50 Sheet Automatic Document Feeder, 3 Button Control Panel, Recommended Daily Duty Cycle: up to 4 500 pages