This device is called Dexcom G7, and it is a medical device for continuously monitoring blood sugar (glucose) levels in the body. It is often used to help diabetics monitor their sugar throughout the day and night without the need for finger pricks every time. 1. What is the device's function? Continuous sugar monitoring It measures glucose levels in the interstitial fluid under the skin and sends frequent readings to a compatible phone or receiver. Displaying readings and alerts It displays the sugar level and its trend: is it rising, falling, or stable? It can issue alerts when sugar is high or low according to settings. Monitoring sugar day and night It helps to notice changes that may not appear when measuring sugar at spaced intervals, including changes during sleep. 4. How long is it used? And is it waterproof? Feature Sensor duration up to 10 days, with an additional grace period of up to 12 hours Showering: Can be worn while showering Swimming: Waterproof within the limits specified by the company Finger pricks: Not routinely needed under appropriate conditions, but you may need it if symptoms differ from the reading Charging: The sensor itself does not need charging; it is replaced.