30 may be polypropylene or other non abs based plastic materials once the fragrance holder 20 is fixed to the back of the robotic vacuum 10 the fragrance module 30 is installed such that the fragrance material 41 is positioned to be in proximity with the exhaust air stream such that the exhaust air can absorb the fragrance and expel it into the surrounding air fragrance housing 30 is formed to the same relative shape and curvature as holder 20 to maintain an adequate air gap 21 between the fragrance housing and the robot vacuum cleaner 10 respectively additional features to fragrance housing 30 may be incorporated to lock the housing into the fragrance holder 20 in order to avoid accidentally being dislodged during use or by children and pets coming in contact with the unit such mechanical locking means may be accomplished by but not limited to are undercuts barbs latches and mechanical fasteners it is understood that while a certain form of the invention is illustrated it is not to be limited to the specific form or arrangement of parts herein described and shown it should be apparent to those skilled in the art that various changes may be made without departing.