Stay ahead of diabetes with the smart continuous glucose monitoring (CGM) system. Introducing the Guardian™ 4 smart CGM system featuring a new transmitter and sensor requiring no fingersticks for sensor glucose readings.* When the Guardian 4 CGM is applied to the skin, it uses a small sensor to measure sensor glucose levels every 5 minutes. Real-time readings are captured 24/7 and sent to a compatible mobile device via Bluetooth®** from a small wireless transmitter connected to the sensor, s