It has many utility functions, such as: fetal heart beat indicator, instantaneous FHR, averaged FHR, manual calculate FHR，brightness mode, auto shut off without signal within 1 minutes, battery indicator and Low battery shut off.

An accurate fetal Doppler

The FHR accuracy is ±1BPM, above土2BPM.

The synchronization between fetal heart beat indicator and fetal heart beat sound is good. No detection miss.

No FHR reduce by one half, or double.

Advanced quick-track technology ensure the display time less than 3 seconds.

Long battery life

Advanced design keeps power consumption low, allowing you to use continually up to 300 minutes, or stand by for 1 month. Better still, these batteries are widely available so you can get replacements almost anywhere.

Technical specification

Power supply: 9V battery

Display: 45*25mm LCD

Barometric pressure: 86 ~ 106kPa

Temperature: +5℃~+40℃

FHR detect rang: 60~ 210BPM

Speaker power: ≤1. 8W

Size: 35（T）× 115（W）× 130（L）mm

Weight: 300g（include battery）