... real-time to upgrade7.Measurement: distance, perimeter, area, volume, heart rate, gestational age.8.Character display: Real-time clock, ... and the operating frequency, full-screen characters editing9.PAL-DNTSCUSB2.O Interface: mouse, PAL-D, NTSC, USB2.O10.Monitor Size: 263mm × ... . C2720R5.OMHzC2-7/20R/5.OMHz frequency tiny convex probe3. L25/7.5MHzL2-5/7.5MHz high-frequency linear array probe4. EL257 ...