fetal heart rate monitor home pregnancy baby fetal sound heart rate detectorOverview: 12. 5 Mhz Waterproof probe High sensitivity of the probe, 12~16weeks can hear fetal heartbeat . 2LCD digital screen Light screen , the digital display is more clearer . 3) Two model shows Press the left button , switch two model shows . 4No radiation After tested , Seldom no radiation . 5Turn off automatically No operation automatically turn down within 60S. Specification: Probe frequency 2. 5 MHz plusmn10% Error range plusmn 2bpm Rate