... 16 kinds of color process, line correlation, frame correlation and linear interpolation, etc.Frequency conversion: 2.5MHz/3.0MHz/3.5MHz ... (Matching 6.5MHZ cavity probe and 7 MHz High-frequency linear array probe).Calculation: distance, perimeter, area, heart rate, pregnancy ... can change to choose an other probe) 1 PCOptionalOther probes(Linear, Small convex, Endo-cavity)USB port and functionNote: You ...