“The first is processor power,” he said. “This isn’t a device that was meant to be worn as a heads up display that’s on 24/7 that’s constantly looking for voice commands. That’s not what Glass was built for, it was meant for episodic use. Using it in this way drains the device like no other. Glass [when used by consumers] is meant to have a battery life that lasts for quite a while, for us it lasts maybe two hours, maybe one. If you turn on all its features, probably less. You can certainly add on a battery pack, and that’s what we did, to get us to 12 to 14 hours. But then you have the processor going all the time and with external charging, this makes for a very, very hot device that is perhaps sometimes dangerous.”
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