Doc holding his binocular card in 2015.
A binocular card was a special pair of binoculars as small and as thin as a credit card. Doc Brown used one in 2015 to watch and also take pictures of Marty McFly Jr. and Griff Tannen from a distance.
Appearances
- Back to the Future Part II
- Back to the Future Part II novelization (First identified as Binocular card)