Review on 🐛 2020 Ultrasonic Pest Repeller - Indoor Plug-in Repellent for Flea, Insects, Mosquitoes, Mice, Spiders, Ants, Rats, Roaches, Bugs - Non-Toxic, Safe for Humans and Pets - 4 Pack by Andrew Dodd

Updated review (Oct 2020): I've had them for a year now. I've only had one apparent technical issue with them so far: one of the night lights isn't working on one of the outlets. However, I originally got them to repel mice and they didn't do it at all. I now have one in the front and back door of our house as well as one just inside. They don't seem to reduce the number of bugs entering the house or congregating around the lightbulb at all. Now that fall has come and all the bugs are trying to get back in, I did an experiment where I unplugged the back door while leaving the front doors plugged in. There was no noticeable difference. I plugged them all back in and there are still a lot of bugs flying in the house when you open the door. All or not, they didn't reduce our pest/insect infiltration at all.