We claim the ornamental design for a keyboard for a hand-held electronic device, as shown and described.
FIG. 1 is a front perspective view of a keyboard for a hand-held electronic device; and,
FIG. 2 is a front elevational view of the keyboard.
The broken lines shown in the drawings of the keyboard for a hand-held electronic device are for the purpose of illustrating portions of the article and form no part of the claimed design.