Convenient And Intelligent Design Split-Type Design: separate design between host and probe to be convenient for finding the place of fetal heart sounds Built-In Trumpet: The built-in trumpet can achieve many people listen the fetal heart sounds at the same time. Power Support: power with dry batteries AAA Advanced technology Angelsounds To Remote Central Monitoring System:It can 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. Angelsounds To PC:Can transmit the real-time sound of fetal heartbeat sounds to the computer saving for memory by specialized data lines Music Player:It can broadcast music. Specification: Utrasound frequency : 3.3 MHz Acoustic intensity: < 10mW/square centimetre Peak negative pressure: <1 Mpa Output beam intensity: <20mW/square centimetre Dimension: 25cm X 24cm X 8cm Standard: CE, EN ISO9001:2000, EN ISO13485:2003, TUV