FIG. 1 is a front view of a robot vacuum cleaner showing the claimed design;
FIG. 2 is a rear view of the robot vacuum cleaner of FIG. 1;
FIG. 3 is a top view of the robot vacuum cleaner of FIG. 1;
FIG. 4 is a bottom view of the robot vacuum cleaner of FIG. 1;
FIG. 5 is a left view of the robot vacuum cleaner of FIG. 1;
FIG. 6 is a right view of the robot vacuum cleaner of FIG. 1;
FIG. 7 is a perspective front, top, right of the robot vacuum cleaner of FIG. 1;
FIG. 8 is a perspective front, top, left of the robot vacuum cleaner of FIG. 1;
FIG. 9 is a perspective rear, top, right of the robot vacuum cleaner of FIG. 1;
FIG. 10 is a perspective rear, top, left of the robot vacuum cleaner of FIG. 1;
FIG. 11 is a perspective front, bottom, right of the robot vacuum cleaner of FIG. 1;
FIG. 12 is a perspective front, bottom, left of the robot vacuum cleaner of FIG. 1;
FIG. 13 is a perspective rear, bottom, right of the robot vacuum cleaner of FIG. 1; and,
FIG. 14 is a perspective rear, bottom, left of the robot vacuum cleaner of FIG. 1.
The broken lines in the drawings depict unclaimed subject matter that forms no part of the claimed design.