features：
▪ delicate appearance, compact design and portable.
▪ audio socket design makes it accessible to headphones or recording devices.
▪ buit-in loudspeaker plays heartbeat sounds.
▪ music can be stored to detect the fhr and perform fetus education.
▪ audio signals can be transmitted to another recording device through attached recording cable .
▪ high sensitive ultrasound probe can detect movement sounds of fetus cardiovascular wall at the 16th week of gestation.
▪ unique manufacturing technology is adopted to generate clear fetal heart sound by minimizing ultrasound noise.
▪ ultrasonic frequency: 2.0mhz.
▪ battery: built in rechargeable lithium battery 7.4v.