Features:
Pocket Fetal Doppler mainly applies to detect fetal heart rate fir fetus of more than twelve weeks;
BF-500D+ with a blue backlight LCD can display FHR, synchronous FHR signal, battery indicator, volume of sound and alarm indicator accurately; Designed for darkness use; With automatic dormany, self-detecting, and alarm function to make caution for abnormal FHR and low battery capacity;
Only 270g, easy to be carried, built-in speaker;
2.0MHz bigger handgrip probe, easy to hold and replaced;
9V dry battery and rechargeable Ni-MH batteries can be alternatively applied.

Specifications:
Ultrasonic frequency: 2.0MHz± 10%( C. W)
FHR display range: 60-210BPM (± 2BPM)
FHR alarm range: < 100BPM or>160BPM
Battery: 9V dry battery
Maximum audio output intensity: ≤ 1.0W
Doppler frequency: 100-3000Hz
Static continuous working time: BF-500D ≥ 8H; BF-500D+ ≥ 5H
Automatic dormancy time limit: 1 minute