Compaq Presario CQ42-400 Notebook Essentials - Windows 7 - Page 33

Appendix B: Specifications Operating environment The operating environment information in the following table may be helpful if you plan to use or transport the computer in extreme environments. Factor Temperature Operating Nonoperating Relative humidity (noncondensing) Operating Nonoperating Maximum altitude (unpressurized) Operating Nonoperating Metric U.S. 5°C to 35°C -20°C to 60°C 41°F to 95°F -4°F to 140°F 10% to 90% 5% to 95% 10% to 90% 5% to 95% -15 m to 3,048 m -50 ft to 10,000 ft -15 m to 12,192 m -50 ft to 40,000 ft Input power The power information in this section may be helpful if you plan to travel internationally with the computer. The computer operates on DC power, which can be supplied by an AC or a DC power source. Although the computer can be powered from a standalone DC power source, it should be powered only with an AC adapter or a DC power source supplied and approved by HP for use with this computer. The AC power source must be rated at 100-240 V, 50-60 Hz. The computer is capable of accepting DC power within the following specifications. Input power Rating Operating voltage and current 18.5 V dc @ 3.5 A - 65 W 19 V dc @ 4.74 A - 90 W ✎ The computer operating voltage and current as well as the adapter wattage can be found on the system regulatory label inside the battery bay. Notebook Essentials 25