The ornamental design for a band and interface for a wearable device, as shown and described.
FIG. 1 is a front right perspective view of the band and interface for a wearable device;
FIG. 2 is a rear left perspective view of the band and interface for a wearable device;
FIG. 3 is a right side view of the band and interface for a wearable device;
FIG. 4 is a left side view of the band and interface for a wearable device;
FIG. 5 is a front view of the band and interface for a wearable device;
FIG. 6 is a rear view of the band and interface for a wearable device;
FIG. 7 is a top view of the band and interface for a wearable device; and,
FIG. 8 is a bottom view of the band and interface for a wearable device with a broken line portion shown removed to reveal the bottom view of the band.
Applicants claim the design for a band and interface for a wearable device shown in the drawing figures. The broken lines shown in the drawings depict portions of the wearable device and form no part of the claimed design.