One of the key advantages of the ASUS ZENBOOK™ is its smartphone-like spontaneity and always-on design. Regardless of how long the Ultrabook™ remains in standby, it can resume in just two seconds thanks to exclusive ASUS Super Hybrid Engine II technology. In effect, this means users have no reason to shut the ASUS ZENBOOK™ down, eliminating the need for lengthy boot ups. And with exclusive ASUS Super Hybrid Engine II technology, the ASUS ZENBOOK™ can stay in standby for up to two weeks*. Instant on functionality automatically backs up data to the SSD should the battery level drop below 5%, removing the risk of data loss due to a drained battery. The ZENBOOK™ therefore adds worry-free usability to its list of advantages.