The Dynatron 150+ is a multi-frequency ultrasound that offers 1, 2 or 3 MHz. Choose 1MHz for deep treatments, 2MHz for moderate depth or 3MHz for superficial depth. Dynatronics′ smartheads™ (sold separately) may be used interchangeably with this ultrasound device (2cm, 5cm 10cm). The Dynatron 150+ offers the ability of 10%, 20%, 50% and continuous duty cycles as well as power settings up to 2 watts/cm2