Fetal heart beat indicator.
4 working modes:
a. Instantaneous FHR.
b. Averaged FHR.
c. Manual calculate FHR.
d. Brightness mode. Instantaneous FHR.
Auto power off without signal within 1 minute.
Can hang it by hang lace
Battery indicator and Low battery shut off.
Optional rechargeable battery (9v) and charger.
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