DYNATRON® SOUNDHEAD, 2 CM² - USE WITH UNIT DY-D125B- Please provide unit serial number in notes at checkout The only Ultrasound devices in the industry offering 1, 2, and 3 MHz frequencies for the greatest flexibility in depth of treatment. Soundhead is compatible with Solaris Plus 709 (D719T), Solaris Plus 708 (D718T), Dynatron 25 Series combo units (D925T, D825T) and our Portable Ultrasound unit (D125B)