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.