The Sonoline B Fetal Doppler is an easy-to-use device for monitoring your baby's heartbeat. Featuring a built-in speaker, this blue doppler provides clear audio for peace of mind. Fetal Dopplers used at home should not replace your regular Doctor visits. Baby Doppler is not intended to treat, cure, prevent or diagnose any medical condition nor to derive at any medical conclusion based on its readings. The use of Baby Doppler is simply to hear a baby's heartbeat for an elevated bonding experience and journey.