This is a 20 MHz Microvascular Doppler System. With the use of the VTI 20 MHz Microvascular Doppler System it is now possible for surgeons to interrogate even 0.5 millimeters blood vessels. A wide variety of surgical specialties can also perform intraoperative assessment of blood vessels with the use of the real-time audio blood flow detector. Surgical specialties include the following: laparoscopic, cardiovascular and neurosurgeries. This comes handy and easy to use and does not call for any special training. Other advantages of this doppler system include long battery life and this also allows you to save much tiime.