Lenovo ThinkPad T550 - I5/8G/256SSD/W8PD (20CK001NUE) 5th Generation Intel® Core™ Processors Windows 8.1 64-bit Operating System Power Exceeding Class Boundaries Passes 11 Military Spec Tests Available 3K, Multitouch, & IPS Displays Renowned Backlit Keys & Three-Button TrackPad Dolby® Advanced Audio™ Speakers more out of-stock