Yes Johnd, your are correct its a Envoy. I have had this for since 2012, and it has been working good until may 2020. Then there where no more data from my ISS. I replaced to a new transmitter (not new ISS) just the transmitter in the ISS) simulare to the the one I had, both are EU modells. But still no data, I'm sure the ISS is on the same ID #2 (push the button on ISS for 5 sek, then push the button on ISS twice, the ISS blinks two times, and the ISS is on ID #2) as my Envoy, but still no data.
I'm start to wonder if the is an fault with the Envoy an not the ISS ??