Exclusive ASUS Super Hybrid Engine II with instant on enables 2-second resume of the notebook from sleep, with up to two weeks of standby time with open files and other pending data kept safe in memory. Plus, automatic data backup when the battery reaches 5% charge further helps secure your work. ASUS ZENBOOK keeps energy saving front and center with a dedicated Battery Saving Mode, which conserves power whenever possible to increase battery life by as much as 25%. You're also always in the know when it comes to the battery thanks to ASUS PowerWiz, a utility that shows exactly how much charge is left per application - web browsing, movie watching. ASUS ZENBOOK combines power, efficiency, smooth usage and user empowerment, all on in one sleek package.