"Problem is we won't be able to show it to anybody."
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"Doc reached in his pocket and pulled out a plastic card with a pair of eyeholes, and the words POCKET BINOCULARS printed beneath. It looked like some cheap, plastic toy, the kind of thing you'd find as a prize in a cereal box. The way Doc handled it, though, Marty suspected it was really a more compact, fully functional future model."
Digital cameras and camera-equipped smartphones of the approximate size and shape of the binocular card seen in Back to the Future Part II are near-ubiquitous items in 2015. The device Doc uses appears to have face recognition software, which is now a standard feature of many consumer digital cameras.