1. Dismountable battery 2. U Disk for upgrade 3. Save 1024 image permantly 4. Test the fishmeal within 2cm 5. Light weight l Batteryl 192-frame cineloopl Two USB portsl SD cardl General software, Obstetrics software and Cardiac software.Software: l General measurement: distance, circumference, volume, angle, heart rate and etc.l Obstetrics measurement software: BPD, GS, CRL, AD, AC, FL, HC, FTA, ...