I don’t know for sure, but I’d be very surprised if this was compatible with Dexcom. Clearly English is a second language for this seller, so the intent isn’t very clear. But, it sounds like it communicates just a few specific bits of information. The fact that there are no user reviews is a red flag. And even if this would communicate Dex info, figuring out how to do that might be problematic, given the lack of clarity in the description!