After reading Renee's comment about the pest control plug-ins (Such as Riddex) I had to comment on them. Before I adopted my 2 furbabies, I had a couple of these plug-ins. The ones I had emitted a high frequency sound as well as some kind of electromagnetic field. Apparently, if you only have the plug-ins that emit the sound, the pest (mouse, bug, or whatever) pretty much has to be in front of the device for it to repel them. With the field, it supposedly penetrates walls and any furniture to further control your pest problem. The reason I had them is because I'm DEATHLY afraid of spiders. Hate them. Anyway, these plug ins also gave me awful headaches and make me feel ill. They had no effect on my 2 yr old daughter or my husband. However, when my sister brought her pet rat over for me to watch for a couple days, the poor thing wouldn't eat or drink and just sat in the corner of her cage and shook! After a few hours of this, I unplugged the stupid things and she was fine - AND my headaches and sick feelings went away. Plus - the stupid things don't work. When I went to unplug them, a spider had made his web around the device! So not only do they bother small animals and possibly cause pain to humans, but they're a waste of money! Just thought I'd share. Melissa [Posted in FML 6485]