The Fetal Dopplex® 1+ fetal heart rate display Doppler offers all the traditional features of an obstetric Doppler, combined with an advanced heart rate display capability. Rugged and reliable, the Fetal Dopplex® 1+ Doppler is ideal for use in almost every setting. Features Include: Real time fetal heart rate display with autocorrelation signal processing. Permanently attached 2MHz waterproof probe with integral probe storage; Low battery indicator.