DexCom makes continuous glucose monitoring devices used by people with diabetes to track their blood sugar levels in real time, without requiring the frequent finger-prick blood tests that older glucose monitoring methods required. Its sensors are worn on the body and continuously transmit glucose readings to a smartphone app or dedicated receiver, giving patients and their doctors ongoing visibility into blood sugar trends rather than isolated point-in-time readings. Continuous glucose monitoring has become an increasingly standard part of diabetes management, particularly for people with Type 1 diabetes and those with Type 2 diabetes who use insulin, replacing older testing methods for a growing share of the diabetic population. DexCom's revenue model includes recurring sales of the sensors that need periodic replacement, giving it a razor-and-blades style revenue stream layered on top of initial device sales, with growth tied to both new patient adoption and broader recognition of continuous monitoring as standard diabetes care.