Dexcom G6 Receiver Device - 1.0 Device Dexcom Continuous Glucose Monitoring (CGM) systems track glucose levels throughout the day by using a small sensor just beneath the skin. This water-resistant sensor continuously tracks glucose levels just and sends the measurements via a transmitter to your display device. An adhesive patch holds the Dexcom CGM sensor in place on the surface of your body. A small touch screen receiver or a compatible smartphone shows real-time glucose level results and historical trends. The CGM receiver and your compatible smart device can also be set to send custom alerts when certain glucose levels are reached.