NOTE: It is recommended that you turn on and shut down your computer at least once before you install any cardsor connect the computer to a docking device or other external device, such as a printer.SpecificationsNOTE: Offerings may vary by region. The following specifications are only those required by law to ship with yourcomputer. For comprehensive specification of your computer go to Specifications’ section in your Owner’s Manualavailable on the support site at dell.com/support. For more information about the configuration of your computer,go to Help and Support in your Windows operating system and select the option to view information about yourcomputer.NOTE: A 64-bit operating system is required to support systems with 2 GB or greater graphics and system memory.Significant system memory may be used to support graphics, depending on system memory size, operating system,and other factors. A 64-bit discrete graphics driver may be downloaded from dell.com/support.PowerAC Adapter 65W and 90WInput voltage 100 VAC to 240 VACCoin-cell battery 3 V CR2032 lithium ionPhysicalHeight (E5440) Touch Non-touchFront - 27.70 mm (1.09 inches) Front - 25.20 mm (0.99 inch)Back - 32.20 mm (1.27 inches) Back - 28.65 mm (1.13 inches)Height (E5540) Touch Non-touchFront - 28.25 mm (1.11 inches) Front - 26.00 mm (1.02 inches)Back - 33.60 mm (1.32 inches) Back - 29.70 mm (1.17 inches)Width Touch Non-touchE5440 338.00 mm (13.31 inches) 338.00 mm (13.31 inches)E5540 379.00 mm (14.92 inches) 379.00 mm (14.92 inches)Depth Touch Non-touchE5440 235.00 mm (9.25 inches) 235.00 mm (9.25 inches)E5540 250.50 mm (9.86 inches) 250.50 mm (9.86 inches)Weight (minimum)E5440 1.99 kg (4.40 lbs)E5540 2.42 kg (5.35 lbs)6