Function: It can detect the Fetal heart,it’s used for detecting the fetal heart at hospital,clinic,family. Technology:Ultrasonic frequency:2.0MHz±10% Power14.4V rechargeable battery Ultrasonic intensity:≤10mW/CM2 Work time:≥8 hours Unit:gross weight:3kg size:34cmx25cmx17cm weight:12kg(4pcs) size:52cmx36cmx36cm Disposition:charger,manual