* 2.4'' TFT color LCD screen, can display FHR value with large font.
* High sensitive probe.
* Automatic power-off.
* Build-in rechargeable Li-ion battery. charge by USB.
* Low ultrasound power, safer to the fetus.
* Earphone port.
* Long working time.
* Accurate FHR and same advanced FHR algorithm with that used in fetal monitor.