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Pro Always on: ePaper display
The back screen writes information in E-Ink, meaning it can display that information without draining the battery. Apps can be set to route incoming information, from, for example, social networks, to that screen.
YotaPhone's signature feature is the dual-screen. On one side it has a typical capacitive 1080p display on the other an ePaper display. On latest generation phones both displays are fully touch compatible.