I'm not sure, but I've never had problems since I've used it. It's just sometimes the high pitched noise can be heard and it bothers me from being so constant. I have a really bad diagnosis of A.D.D. so it's soething that really sets me off. Goodluck <3
Da1KrayzieThug Reviewed by Da1KrayzieThug on . ~Spider Help~ Black and Decker makes a little device which costs under 5.00 that will keep spiders at bay.It is a device that sends out vibrations that the bugs hate.I would place them in a socket near any entrances where spiders may enter.I swear they work.. Rating: 5