I forgot who or which Diabetic website posted a question asking how long their Dexcom Seven Plus transmitter chip lasted? Also the person asked if you can find out when (date) your transmitter chip was made?
I started Dexcom Seven Plus the beginning of May, 2009. Well.... Yesterday at 4pmish I got the "Out of Range" alert and no matter what I did my blood sugar levels didn't show up ever again (I even sat it out for more than 12 hours and tried to stop sensor and restart, etc., everything!). As the needle came out with my sensor - I also believe the transmitter chip has died. I called Dexcom today and for now they are saying it is most likely the transmitter chip (battery part) has died but had me send my data so they can verify. So for me the transmitter chip lasted a little over a year and I used Dex everyday (out of the whole time of having Dex - I only had a 4 day break). The tech person couldn't tell me the date when the transmitter chip was made.