I'm trying it out now and I don't know the functionality yet, but I think it's a good product because I trust Mr./Ms..

My daughter purchased these & is very happy with them so I am eager to give them a try. I hate insects of all sorts!

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4/6pcs, Dual Horn Ultrasonic Pest Repeller For Indoor Pest Control - Effective Electronic Insect Repellent For Home, Kitchen, And Warehouse - Say Goodbye To Mosquitoes And Other Pests