Ultrasonic equipment generates high frequency sound waves(1MHz) that are transferred to a specific body area via a round-headed probe. The sound waves travel deep into tissue for 4-6 centimeter and creat gentle heat. As the probe glides over the skin's surface, sound waves penetrate the skin's surface causing soft tissues to creating deep heat. In turn, the heat induces vasodilation: drawing blood into the target tissues. Increased blood flow delivers needed oxygen and nutrients, and removes cell wastes. The deep heat helps to relieve pain, inflammation, reduces muscle spasms, and accelerates healing effect.