Calculating FHR with the same DSP techniques as used in fetal monitor, to ensure the FHR accuracy and reliability.
 High sensitive transducer, low ultrasound power
 Friendly man-machine interface
 Built-in speaker
 3 AA batteries (dry or rechargeable) powered, with battery power status indicator
 Battery management function: in the normally working state, it will power off automatically if no signal after 1 minute