The Medtronic has a few components the actual sensor is enlite and the transmitter component is the Guardian Connect. If you have a Medtronic pump or are interested that one is the way to go. I have no experience with the dexcom, however there is another one out there Libre by Abbott. I can than the Libre to pushing me down the pump path, however I have found the Libre sensors the easiest to stick on also very unreliable. As I have to pay for them AUD$95.00 very disappointing that 3 out of 11 sensors failed, one failed in less than a day. Libre you have to wave a reader or android phone over it, the others are quite a bit smarter and will talk to phones or pumps well at least the Medtronic does.