The YotaPhone 2 features a 5-inch front-facing 1920 by 1080 AMOLED 'retina' display (it has a pixel density of 442ppi), and on the back in a 4.7-inch, 16-level grayscale 960 by 540 e-ink display (235ppi pixel density) display. It is an upgrade to the original dual-display YotaPhone, which suggests that there is a demand for a handset with a second screen.
Both displays are touch-sensitive, and both are protected by a layer of Corning Gorilla Glass 3.
The second display opens up a whole raft of possibilities, from simply mirroring the main display on the back to having it display notifications or a photo. Is it a gimmick? Sure, but it's still a cool idea, and one that I'm surprised hasn't been adopted by a bigger hardware maker.
Beyond the display, the YotaPhone 2 is a pretty standard high-end Android smartphone. It runs Android 4.4 KitKat and is powered by a 2.2GHz Snapdragon 800. It has 2GB of RAM and 32GB of storage, and has a full compliment of sensors (accelerometer, compass, gyroscope, proximity sensor, and ambient light sensor).
The YotaPhone 2 has gone on sale in Europe and costs €700 (around $850), so this is a piece of hardware with a premium price tag. But it's also an interesting idea, and your money certainly buys you something more interesting than an iPhone or a Samsung Galaxy S5. You're certainly getting something that's at the very least going to be a talking point, and which, depending on your usage, could be useful.