ASUS today announced the latest version of ZenBook S (UX391FA), a premium 13.3-inch ultraportable Windows 10 laptop now upgraded with power-saving components that enable a remarkable 20-hour battery life, along with the latest Intel Core processors for enhanced performance. These new improvements make ZenBook S an even more compelling choice for discerning on-the-go users, offering effortless portability, powerful performance and no-compromise connectivity, combined with military-grade (MIL-STD-810G) toughness.