Lenovo's ThinkPad T series notebooks have long been the gold standard for mainstream business systems because of their strong performance, superior build quality. the T420 is designed for durability. The rubberized ABS plastic lid, carbon-reinforced bottom, and internal roll cage help protect against shocks.

Embedded numeric keypad and integrated UltraNav dual-pointing system with wide touch pad below keyboard, Tap Zones, scrolling regions label, multi-touch;and TrackPoint and customized touch pad for the ultimate in pointing flexibility.ThinkVantage button, individual speaker volume up, down, and mute buttons, mic mute button.The keyboard has a Fn key which is a special key and is located in the lower left corner. The Fn key allows the user to instantly activate the following operational features by pressing the Fn key and a designated function key.

Two SO-DIMM Slot.The use of 1333 MHz SO DIMM memory is recommended for this system.Supports one additional hard drive which can be used concurrently to offer expanded storage in the Ultrabay Slim Media Bay.Although you can upgrade the hard drive, it is not designed to be removed and reinserted on a regular basis. Repeated and frequent removal, for purposes other than to upgrade for greater capacity, can cause damage to the system. The Ultrabay Slim hard drive adapter is designed to provide this flexibility with a second hard drive in the Ultrabay Slim.The Hard Drive Active Protection system protects your hard drive when the shock sensor inside your ThinkPad computer detects a situation that could potentially damage the hard drive.