It is very advanced obstetrical fetal doppler, which used to detect the FHR (Fetal heart rate), can meet routine

It is very advanced obstetrical fetal doppler, which used to detect the FHR (Fetal heart rate), can meet routine examination requirements of obstetricians. The device is consists in the following procedure:Ultrasonic signal emit.Analog signals process.Fetal heart rate calculate and display.It has a 2 sockets for audio output can be connected with headphone or audio recorder. It use standard AAA Voltage DC battery.