An ultrabook is a specific type of ultramobile notebook, defined by Intel. Ultrabooks are thin, lightweight and offer longer battery life by utilizing new low-power CPUs integrated with instant-on capability, all without compromising performance. Although Intel is likely to update its requirements for what constitutes an Ultrabook, it currently has the following attributes: less than 21-mm thick, instant-on, minimum battery life of five hours, security features, a screen size of 11 inches or more, and Intel processors based on Ivy Bridge architecture.