... , no keyboard, no knobs, it integrates ultrasound power in a probe can be connnected to Windows XP, Windows 7 Dear Customer ... -112mm, step=7mm);-Focus: C3 (R60) probe: 15 levels (25-150mm, step=5mm); L7 (L40) probe: 15 levels (15-85mm, step=5mm ... ; Obstetrics: BPD, FL, CRL, HC, AC, gestation age, fetal weight; USB B-type ultrasonic scanner (new products, high quality, creative design)