Swing through the treatment range with the SonoSwing. With therapeutic ultrasound, the depth of penetration is dependent on the carrier frequency. Most ultrasounds on the market have two such frequencies - one for surface treatment, and one for depth. You can only select one or the other - with no variation in between. This Ultrasound Head is specifically designed for use with the SoleoLine. The Small applicator head is 1 cm which allows for a more focused and refined treatment for smaller areas. This ensures that optimal energy transfer is delivered to patient for 0.8 and 2.4 MHz.