 peppermint oil and a predator scent in it so you can't detect it humans can't detect it but it deters rodents in four ways the scent the taste the touch and the predatory fear that's in the product itself so mice smell it and they literally run the other direction they've seen it in testing happen and it's 92 effective to keeping mice out of vehicles which is incredible and you can put a little bit of the mouse out under the hood in key areas too correct and that if something gets under the hood it's going to be pushed out as well yeah yeah