Specifications189ETemperature Operating: 50° F to 90.5° F (10 to 32.5° C)Storage: 41° F to 95° F (5 to 35° C)Humidity Operating: 20 to 80% (without condensation)Storage: 10 to 90% (without condensation)ADF (automatic documentfeeder) Up to 50 pages (Staggered) 20 lb (80 g/m 2 )Recommended Environment for Best Results:Temperature: 68° F to 86° F (20 to 30° C)Humidity: 50% - 70%Paper: Xerox 4200 (20 lb/Letter)Upper Tray 250 Sheets 20 lb (80 g/m 2 )Lower Tray (option) 250 Sheets 20 lb (80 g/m 2 )