Delicate appearance, compact design and portable. Double-channel audio socket design enables it to provide synchronous audio output signals, accessible for headphones or recording devices. Seperated loudspeaker design. LCD display FHR clearly Simple one-button operation, controlling power and volume as well. This device can record FHR and audio signals can be transmitted to another recording device High sensitive ultrasound probe can detect movement sounds of fetal cardiovascular wall at the 16th week of gestation.