The CHOICEMMED MD800 Fetal Doppler Probe is equipped with a clear TFT display, allowing for precise monitoring. This reliable monitor accurately tracks the baby's heart beat throughout pregnancy. The CHOICEMMED MD800 Series Fetal Doppler is a hand-held device that is non-invasive and has high performance in detecting fetal heart rate. This enables parents to closely monitor their baby's status and seek prompt medical attention if there are any abnormalities in the FHR. Gel has been open & used, plenty left.