The Think Pad T420s maximizes performance & offers a higher level of productivity for todays mobile business professionals. These laptops are built upon a platform of Lenovo innovations that respond to key business needs including: video & voice calling, smart PC features for power & performance management, all-day battery life, enterprise management & an intuitive, easy-to-use computing experience. The ultra-thin Think Pad T420s speeds up boot time 30 percents with Lenovo Enhanced Experience 2.0. The Think Pad Mini Dock Series 3 is ideal for notebook users who need easy access to the Internet/ LAN, multiple USB (Universal Serial Bus) devices, audio & video equipment, & robust key lock security. The Think Pad Mini Dock Series 3 is compatible with Think Pad T400s notebooks.