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The Portable Ultrasound is a therapeutic ultrasound device that generates deep heat through a piezoelectric crystal sound head. Unlike electrical modalities, ultrasound 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 vasodilation Treatment duration is determined by the medical practitioner and may range from 2. ~5 minutes depending on the conditions treated and anatomic target site. Because air is a very poor sound conductor ultrasound gels are used to conduct the wave energy to the skin. Package Includes: Hand Held Ultrasound Unit A/C 110V Adapter 4oz Water Soluble Gel Instruction Manual Technical Specifications: Power Source: AC adaptor 110 Volts AC (15 Volt DC) Frequency 1 MHz Output Power: 0.5watt/cm2±1O% ERA Treatment area 3.8 cm2 Mode Pulsed Switch On/Off Feature: Treatment Head warming Times Selling:10 minutes - then AUTO-oft Ultrasound Gel Water soluble Dimensions 50 x 45 x 190 (mm), 2' x 1 .811 x 7 Weight: 200 Grams