The stethoscope redefined diagnosis of disease from external evaluation of symptoms to internal auscultation, without using lethal, invasive instruments to explore internal anatomy. With the help of a stethoscope you can hear, both normal and abnormal sounds of respiratory organs. You can also use it for hearing of pleural, cardiac, arterial, uterine, venous, intestinal and fetal and sounds. This aids effective diagnosis and evaluation of patients. Stethoscopes are painless and only require skin contact. Also they are quick and easy to use and require no previous training to handle. Electronic stethoscopes, as mentioned previously, amplify sounds and can also record the audio output. This simplifies sharing of audio recordings with others, even if remotely located. Evaluation of recordings at a later time as well as portability of the information is possible due to electronic stethoscopes.