... Colors, column correlation,frame correlation, spot correlation, linear interpolation, etc Multi-frequency: 2.5MHz/3. ... multiple probes connectable, USB port, Video thermal recorder.Probe connectors: 2 socket, multiple probes connectableGray scale: ... 5MHz multi-frequency convex probeOPTIONALHigh frequency linear probe, electronic transvaginal probe, rectal probe, vidco thermal recorder, ultrasound image ...