[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 <img src="https://cc-west-usa.oss-accelerate.aliyuncs.com/593c4077-4ae5-4208-b125-c136dc5e47b3.jpg" style="max-width:100%;"><img src="https://cc-west-usa.oss-accelerate.aliyuncs.com/338dd1f4-644d-4a5a-aee7-e05d49fef1fb.jpg" style="font-size: 14px; max-width: 100%;"><img src="https://cc-west-usa.oss-accelerate.aliyuncs.com/f98e124e-78d3-41c2-9b01-af3245f3ddc4.jpg" style="font-size: 14px; max-width: 100%;"><img src="https://cc-west-usa.oss-accelerate.aliyuncs.com/ac7ac517-3eb4-4980-b990-d1972c5a57d4.jpg" style="font-size: 14px; max-width: 100%;"><img src="https://cc-west-usa.oss-accelerate.aliyuncs.com/327cd8bb-1f52-406e-9864-2e2d9c3b438d.jpg" style="font-size: 14px; max-width: 100%;">

Pregnant women monitor Doppler fetal heart rate