... Scanner Box, only need to connect to external 220V ac power, probe and any computer. Then install the software ... and calculation: B mode: distance, circumstance, area, volume, angle, ratio, stenosis, profile, histogram;M mode: heart rate, time ... frequency: 5 segment frequencies*Scanning by angle: 12 angle scanning*Image direction: Up/down/left/right*Dynamic range(contrast): Continuous adjustable ...