A smartphone with two screens has been launched, with one screen using e-ink technology.
The Android powered phone promises to extend battery life, by transferring web pages and other applications to the e-ink screen.
The phone has one LCD display, with a second e-ink screen, that lets users see what they want without having to wake up the phone.
E-ink displays are commonly used for e-book readers and consume very little power. They are also easier to read in the sun rather than their LCD equivalents.
The Russian company Yota said the phone would go on sale online immediately in Russia, Austria, France, Spain and Germany.
Yota devices Chief Executive Vlad Martynov said: "The typical user picks up and activates their smartphone more than 150 times a day.
"Why? Because users worry that messages or information they need or want are hidden behind their phone's black screen. This is a huge distraction and can impede meaningful interaction with our friends, families and colleagues."
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