HP Scanjet N7710 Document Sheet-feed Scanner - Manual (Page 17)

Minimum thickness: 0.10 mm (0.004 inches)
Maximum thickness: 0.84 mm (0.033 inches)
The capacity of the card slot is 1 card at a time.
Load a card into the card slot face down with the long dimension parallel to the side of
the scanner and the top of the card toward the left as you face the scanner.
NOTE: Be sure to scan only one card at a time in the card slot.
(continued)
Load a card into the card slot 15