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Fetal doppler HE-510, static continuous working time ≥ 4h, 10-40℃ working temperature
Ultrasonic frequency: 2.0MHz±10%
Ultrasonic intensity: ≤10mW/cm2
Comprehensive Sensitivity: ≥90dB
Isptp: ≤0.1MPa
Maximum audio output intensity: ≤1W
Doppler frequency: 100--3000Hz
Static continuous working time: ≥4h
Working temperature: 10-40℃
Humidity: ≤80%