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"It saves a lot of battery and gives effortless notifications. We all know the feeling of being in a meeting and needing to check an SMS and doing it under the table. Or to check Twitter; the phone is just lying on the table," Geckler explained.
While it sounds like that might defeat part of the battery-saving justification that underpins the e-ink display being there at all, you can also control how long you want the radios switched on for; so if you only want live data for mapping or social network updates for 10 minutes, you can set it for just that.