Specification:

Safety:
Class II, Type B

Power Supply:
DC, AAA or rechargeable battery
Continuous operating time: >4 hours
Speaker power: 1W
Auto shut-off: no signal, no pressing key operation, it will power off automatically after 1 minute

Ultrasound transducer:
Working frequency: 2.0MHz
Working mode: Continuous/pulsed Doppler
Effective ultrasound send/incept area: 490mm2
Ultrasound strength: <=5mW/cm2
Total sensitivity: >=90dB, at the distance 200 mm to the surface of the probe, the target frequency is 140bpm

FHR:
Automatic FHR sound detection or speaking FHR
Measurement range: 50~210BPM of 2.0MHz
Measurement accuracy: ±1% or ±1BPM

Dimension & Weight:
140 x 60 x 50 mm
300g