1Pcs Ultrasonic Pest Repeller Electronic Insect Repellent Indoor Mosquito Repeller For Spider Mosquito Rats Bugs

I recommend it to everyone for indoors. I haven't tested it in the garden or anyway in an open space, but it's very good in the house. In the rooms where I put one each, there isn't a single mosquito, even though I left the doors and windows open. It has no effect on flies or other insects.