Specifications .Standard probe: 3.5MHZ Convex; .Detecting depth: e 220mm; .Blind zone: d5mm; .Display mode: B; B+ B; B+ M; M; 4B .Gray Scale: 256; .Image amplification: × 1.0; × 1.2; × 1.5; × 2.0; .Local zoom: 2 times; .Electronical focusing: 4 focuses combination randomly; .Depth shift: B, B+ B modes real time shift; .Resolution: laterald 2mm; axiald1mm; .Frame correlation: B, B+ B modes 3 level; .Image reverse: up/ down; left/ right; black/ white; .Measurement: distance; circumference; area; heart rate; gestational week; fetal weight etc; .Annotation: time; date; ID; age; sex; detecting depth; probe type; focus; frame correlation etc; .Chinese-English inter-conversion; .Cine-loop; 341 .Image load/ storage; 32 .Obstetric table: BPD; CRL; GS; FL; AC; HC; FW; EDD; .Body marks: 40 types; .Optional probe: 7.5MHz ( linear) ; 6.5MHz Convex Trans-vaginal;