711TEK Ultrasonic Pest Repellent, ZS-2033 Electronic Pest Control Repeller Plug in, Pest Repeller for Mouse, Roaches, Bugs, Fleas, Mosquitoes, Spiders 4 Packs [2019 Upgraded] (Black+White)

Plugged them in and they have worked fine for over three months. Like the added bonus of providing a night light. I have not noticed any insects since they have been installed. Used them in bedrooms, Kitchen and basement.

Okay