Smart pen

FIG. 1 is a front and right side perspective view of a smart pen showing our new design;

FIG. 2 is a back and left side perspective view thereof;

FIG. 3 is a right side perspective view thereof;

FIG. 4 is a front perspective view thereof;

FIG. 5 is a bottom perspective view thereof;

FIG. 6 is a top perspective view thereof;

FIG. 7 is a right and back side perspective view thereof, with detached top cap; and,

FIG. 8 is a close-up view of the detached top cap thereof.

Any broken lines in the drawings are included for the purpose of illustrating environmental structure and form no part of the claimed design.