1. Listen to fetal heart sounds heart rate.
2. Listen to the gastrointestinal motility.
3. Listen to the sound of the lungs.
4. Listen to heart rate blood vessels of the noise.
5. Large bell-shaped head can auscultate.
6. Medium bell-shaped head for narrow areas, such as ribs and other narrow positions.
7. Small bell-shaped head, baby low sound quality, child buzzing sensitive.