Medical Products Online - US 1000 3rd Edition - Professional Portable Ultrasound System is a therapeutic home Ultrasound device. Unlike electrical modalities, an Ultrasound machine is unique in that the longitudinal waveform associated with sound is not electromagnetic in nature. The piezoelectric crystal converts electrical energy into a strong vibratory sound wave or Ultrasound, a sound beyond the normal range of our hearing. Sound waves cause vibration in soft tissue cells, increasing temperature and inducing vasodilatation. This systems is complete with everything you need to address you pain management including Ultrasound Conductive Gel.