I hate to say this BUT my house i can spot the small roach and spiders almost everywhere, even thought i clean and mop my house every 2 or 3 days. I dont have a pet, tile, no carpet and not stuffy my house, but i dont know where they are come from and once awhile, big spider 😱 the one i scare the most. I try every remedy like DIY thing, bought the roach powder, trap... almost everything but it didnt work at all. So i saw this ultrasound pest repelling , i think let me try , it could be work, also it said PEST, so it means almost every insect stuff. I tried plug in and day by day. I start to see less and less roach come out at night time, the same as spiders too. Easy to use , cut down my money on buy other product from the store, and just plug in, DONE , easy peasy .And now 90% of them are gone. I think I'm not gonna worried about insect crawling inside my house anymore, not like last year, so bad. Thanks to this ultrasound pest repelling, i can relax a little bit from my cleaning routine.