Ultrasonic devices use high-frequency sound waves, typically above 20 kHz, to perform various functions. These devices can be found in applications such as cleaning, medical imaging, and pest control. They work by emitting sound waves that are inaudible to humans, which can create vibrations or images depending on the device's purpose. In medical settings, ultrasonic devices, like ultrasound machines, are used to visualize internal organs and monitor pregnancies. In cleaning, ultrasonic cleaners use these sound waves to remove dirt and contaminants from delicate items, such as jewelry and electronic components. Their versatility makes them valuable in many fields.