We purchased this flea collar to put into our bagless vacuum cleaner so that we have extra protection against fleas. I cut the flea collar in half and taped it inside the canister so when we dump the canister, we don't have to sift through the dirt. So far, so good.
This collar has a VERY strong smell. It permeated any room where the cats were. Just to pet a cat would transfer it to my hands. If I received a nose bump or a rub from one of them my lips would tingle ! They seem to be fine, but this is not a pleasant product to have in your home.