Lenovo ThinkPad 390X User's Reference for ThinkPad 390 - Page 152
Specifications, Nonoperating: -20°C to 60°C -4°F to 140°F
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Specifications Specifications Size With a 12.1-inch or 13.3-inch display: Width: 315 mm (12.4 in.) Depth: 255 mm (10 in.) Height: 45.7 mm (1.8 in.) With a 14.1-inch display: Width: 315 mm (12.4 in.) Depth: 260 mm (10.4 in.) Height: 46.7 mm (1.84 in.) Environment Temperature (at altitudes less than 2438 m 8000 ft."): Operating with no diskette: 5°C to 35°C (41°F to 95°F) Operating with a diskette: 10°C to 35°C (50°F to 95°F) Nonoperating: -20°C to 60°C (-4°F to 140°F) Note: When you charge the battery pack, its temperature must be at least 10°C (50°F). Relative humidity: Operating with no diskette: 8% to 95% Operating with a diskette: 8% to 80% Maximum altitude: 3048 m (10,000 ft.) in unpressurized conditions Maximum temperature at 3048 m (10,000 ft.): 31.3°C (88°F) Heat output Approximately 48 Kcal per hour Electrical (AC Adapter) Sine-wave input, at 50 to 60 Hz is required 136 ThinkPad 390 User's Reference