Function:It can detect the Fetal heart,it’s used for detecting the fetal heart at hospital,clinic,family. Technology:Ultrasonic frequency:2.5MHz±10% Power:9.6V rechargeable battery Ultrasonic intensity:≤10mW/CM2 Work time:≥6 hours Unit:size: 20.0cmx16.5cmx6.5cm Packaging:gross weight: 13.5kg(20pes) size:45cmx35.5cmx35.5cm Disposition:charger,gallus,manual