נשים בהריון עוקבות אחר דופלר דופלר

[Product name] Doppler fetal heart rate monitor
[Rated voltage] 6 DC3V
[Battery Type]: Two AA batteries
[Fetal Heart Rate Range]; 50BPM 230BPM
[Ultrasonic frequency]; 3.0MHz
[Fetal heart rate measurement accuracy]: +2BPM measurement error less than 2