The APK is developed by the Youkey Bio-Medical team for the Youkey Pocket Ultrasound System. The user interface is friendly and the operation is simple. The handheld Doppler diagnostic apparatus is suitable for the examination of abdomen, heart, small organs (mammary gland, testis, thyroid, etc.), peripheral blood vessels, fetus,transrectal, vagina, children, newborn's head, musculoskeletal (routine and superficial), intraoperative and transcranial.The user interface is friendly and the operatio