Abstract: A vapor-emitter capable of continuously and slowly emitting vapors, and repeatedly and rapidly expelling a boost of vapors, into the atmosphere surrounding the container, comprising a container having at least one slow release generator positioned therein, characterized in that the container is provided with at least one opening at two different locations, the slow release generator being part of or forming a substantially vapor-tight partition between the locations and being in contact with the atmosphere on both sides of the partition, and expelling means being provided for expelling vapor-containing air from the container.