features：
▪ delicate appearance, compact design and portable.
▪ simple one-button operation, controlling power and volume as well.
▪ double-channel audio socket design enables it to provide synchronous audio output signals, accessible for headphones or
recording devices.
▪ audio signals can be transmitted to another recording device through attached recording cable .
▪ high sensitive ultrasound probe can detect movement sounds of fetal 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: 3.0mhz
▪ battery: 9v