The Guardian™ Link 3 Transmitter is a component of the continuous glucose monitoring (CGM) system for the MiniMed™ 770G insulin pump. The transmitter is compatible only with the Guardian Sensor 3 glucose sensor. The transmitter collects data from the sensor. The transmitter then wirelessly sends the data to the insulin pump. Guardian Link, 3 Transmitter is used in conjunction with a compatible CGM for the MiniMed™ 670G insulin pump and other Tandem devices. The transmitter is included in the Guardian Sensor 3 Kit or can be purchased separately.