We claim the ornamental design for a breath detection device, as shown and described.
FIG. 1 is a perspective view of a breath detection device showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top view of thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a right-side view thereof;
FIG. 7 is a left-side view thereof; and,
FIG. 8 is a perspective view thereof shown in a position of use, attached to a mask assembly.
The broken line showing of the mask assembly in FIG. 8 illustrates the environment and forms no part of the claimed design. All other broken lines illustrate portions of the breath detection device which form no part of the claimed design.