Fetal Doppler is designed to meet routine examination requirements for pregnant women in hospitals and clinics even at home, it is a high performance model with FHR digital and waveform with backlight . The Doppler uses ultrasound technique to detect Doppler sounds from the fetus as early as 16 weeks of pregnancy to the baby's first moment of life. Features: 1. Portable and light weight, easy to operate 2. LCD data and wave display with backlight, 3.Accurate FHR detection with clear sound 4. Li-ion battery and battery capacity indicator 5. High sensitive ,1MHzor2 Mhz doppler transducer 6. Advanced digital signal processing (DSP) technique is applied for real-time calculation of FHR 7. Date and time function. 8. Long time continuous use ( more than 4 hours) 9. Auto power off for energy saving 10.Built-in speaker and ear-phone output 11. Low ultrasound power, safe to the fetal Option:Maternal SpO2