Shenzhen Bestman's prtable Fetal Doppler is used to detect fetal heartbeat rate from the twelfth week for pregnant women. It has an LCD display for the FHR, and built-in dry battery that can work for more than 6 hours continuosly. The product also has an automatic power off (3 minutes) and an alarm feature when the FHR is out of the normal range or when there is shortage in power. It has a built-in speaker and comes with an earphone jack. The portable Fetal Doppler has a dimension of 38cm x 28cm x 20cm and a gross weight of 4.5kg.