Feature: - Split-type design: separate design between host and probe - Power with dry batteries AAA - The probe taking the principal of fetal ultrasound to collect the fetal heart beat signals of fetus - Function: - Acquire the fetal heart signals from fetus broadcast the fetal heart sound through headphones or host embedded rock. - Can broadcast music. - Can be used singly and also transmit the fetal heart signal to the Remote Central Monitoring System in hospital through ordinary monitoring telephone to provide diagnosis for doctors enjoying the hospital experts' diagnostic services at home. - Can transmit the real-time sound of fetal heart to the computer saving for memory by specialized data lines. - Characters: - Small beautiful appearance - Super aerodynamic design - Strong ability of processing fetal heart signals - Invulnerable to outside interference: isolation of probe and host small and humane design which are more convenient to find the place. - Specification: - Ultrasound frequency : 3.3 MHz - Acoustic intensity: - Peak negative pressure: - Output beam intensity: - Dimension: 25cm * 24cm * 8cm