Ultrasonic devices use high-frequency sound waves, typically above the range of human hearing, to perform various functions. These devices can be found in applications such as cleaning, medical imaging, and pest control. For example, in medical settings, ultrasound machines utilize ultrasonic waves to create images of internal organs, helping doctors diagnose conditions. In addition to medical uses, ultrasonic devices are also employed in industrial cleaning, where they can remove dirt and contaminants from delicate items like jewelry and electronic components. Furthermore, some pest repellers use ultrasonic sound to deter rodents and insects, making them a popular choice for pest control without chemicals.