Useless

It basically is a low pass filer for real time audio. The audio itself its even hard to hear due to the fact that its now even preamplified.

I uninstalled it after a minute

itworkslike99 about Flutter | Baby Heartbeat Monitor - Doppler Baby's Fetal Heart Beats in Pregnancy Free Obstetric Stethoscope or Ultrasound when Pregnant, v1.4