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.