Read product information for the Lenovo ThinkPad T40 (237475u) PC Notebook 

A full 30 percent thinner than its T30 predecessor, the ThinkPad T40 has a travel weight of only 4.5 pounds - almost one-half pound lighter - and measures about 1-inch thin. The redesigned ThinkPad T40 is an ideal machine for mobile users who need a lightweight notebook with extensive functionality. The IBM Think Strategy of innovation for business advantage has led to the creation of the Ultrabay Slim, making IBM the first adopter of the 9.5 mm optical drive - 31 percent smaller than standard optical notebook drives. Combined with a unique thermal design to reduce system operating temperature, this innovation helped IBM to slim down the ThinkPad T40 without losing functionality. The ThinkPad T40 notebook also comes standard with DVD or CD-RW/DVD Combo drives and IBMs patented UltraNav pointing device, a multi-pointing system that combines the latest full-function TrackPoint device with an IBM-customized touch pad. The ThinkPad T40 offers several battery choices to achieve all-day computing, including up to 9