Here's some information about this type of product:
Pest Repellent Technology:
It uses ultrasonic, electromagnetic, and/or bionic pulses to create an uncomfortable environment for pests, encouraging them to leave the area rather than killing them.
Target Pests:
These devices are commonly used to repel a variety of pests, including mice, rats, mosquitoes, cockroaches, spiders, ants, and more.
Usage:
They are typically plug-in devices designed for indoor use in homes, offices, warehouses, and other enclosed spaces.
Limitations:
Ultrasonic waves generally cannot penetrate walls or solid objects, so multiple units might be needed for larger or multi-room areas.
Safety:
Many models are advertised as safe for humans and pets, as the frequencies used are often inaudible to them.