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The ornamental design for a wireless smoke detection unit, as shown and described.
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FIG. 1 is a front elevational view of a wireless smoke detection unit showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a side elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a perspective view thereof with the access door pivoted to a closed position; and,
FIG. 7 is a perspective view thereof with the access door pivoted to an open position.
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