Certainly there have been devices that’ve had second displays in the past – everything from the Kyocera Echo to the lesser-known Samsung Doubletime. What’s been missing from this equation hasn’t been the hardware, but the skillfully implemented purpose achieved. In the LG V10, you’ve got a second display that shows you the time. It’ll show you some other things, too, but the second screen shows you the time – and, most important of all – it shows you this information without giving your battery a hit.
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https://www.slashgear.com/lg-v10-review-part-ii-what-no-other-phone-has-19415323/
