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100--3000Hz fetal doppler HE-500D, FHR alarm range ≤ 100bpm or ≥ 160bpm
Ultrasonic frequency: 2.0MHz±10%
Ultrasonic intensity: ≤10mW/cm2
Comprehensive Sensitivity: ≥90dB
FHR range: 60--210bpm(±2bpm)
FHR alarm range: ≤100bpm or ≥160bpm
Isptp: ≤0.1MPa
Maximum audio output intensity: ≤1W
Doppler frequency: 100--3000Hz
Static continuous working time: ≥2h