Returned the CGM which is a joke with all of the calibrations and the sensor failing after four days when in reality it should last seven days. But I digress. So I returned the five unused sensors and the transmitter under the evaluation return policy. Fifteen days after UPS shows that it arrived back at Medtronic and I still have not received a refund. Had to call Medtronic and ask for a refund. They were only going to refund the transmitter until I reminded the representative that I would also like a refund for the returned sensors. User's recommendation: Love my pump, steer clear of the CGM.