1.77"TFT colour LCD displays FHR Number and Curve(dual interface),Monitoring time,probe frequency,counting mode,volume and battery capacity.
Abnormal sound alarm with Fhr data turning from green to red.
Function setting : switch interface ,count mode,alarm switch,FHR upper &lower limit alarm setting and language.
Automatic power off(one minute)
Various frequency probe for different use.
Battery: 8.4Vrechargeable battery /9V dry battery.