Lenovo ThinkPad X250 20CM 12.5" Ultrabook, 8 GB RAM, 500 GB HDD, 16 GB SSD Cache, Black (20CM002YUS) Lightweight and portable, measuring 20mm thin and weighing less than 3 pounds Increased performance Enhanced user experience Enhanced backlit keyboard With power Bridge functionality, users can swap out the removable battery for the 6-cell travel battery without powering down the system