Designed specifically to address the firm necessities of the maternity and obstetrician assistants, the AG-21A is a portable Foetal Doppler of superior quality. The product is ideal for the inspection of the foetal heart rate, in the cases of premature pregnancy. After around 11 weeks of pregnancy, formation of the foetal heart takes place and its heart rate is sensed subsequently. A special sound processing has been implemented, without losing receiving signal technology. This ensures the probe's high degree of sensitivity, along with sound effects of high fidelity. The single-chip of the computer manages the charging process. This guarantees the longevity of the battery as well as safety of charging. Implementing spare parts of reputed brands from abroad, the device promises superior quality and is effectively made. The device has been further endowed with certain qualitative attributes.