Easy Peasy & Safe
My house was built in 1925 and seems to attract mice, snakes, bats, fleas, and lots of insects.  Based on the reviews, I thought I would take a chance and order.  I put the first two in my basement and all the bugs who crawled in underneath the door are gone!  I'll be ordering more for my kitchen and by the front door.  There is no sound or odor; I feel safe having these in my home and around my children.  If they last as long as the product info says, it was money well spent.
Rating: 5 stars