I am late to the party but I just discovered this. Would like to figure out a way to attach it to the CGM. It gets perpetually lost in our house. https://www.thetileapp.com
there is another one that is much cheaper, let me go look. Because I know that the tiles have been slow to ship. We are in the cloud with Nightscout so all of the lost phone type of apps are good for us, now.
I would caution anyone from preordering a product that isn't shipping yet. Over the last 3 to 4 years I have pre ordered 4 products through crowd funding and have gotten nothing yet. The first one I preordered was supposed to ship over 2 years ago.