Home using fetal heartbeat product,strong ability of
processing fetal heart signals record real-time fetal
heartbeat sound and  replay it,LED displays the FHR,
can be used singlely or connected with the Remote Centre of
Monitoring System in hospital.safty,convenient,light measurement and humane design.monitor and protect your baby at any time,any where.it is the best gift for your baby.
Specification:  
  Utrasound frequency : 3.3 MHz  
  Acoustic intensity: < 10mW/sq.cm  
  Peak negative pressure: <1 Mpa