I'm always a bit paranoid about losing my Dexcom G4 receiver and my Ping meter/remote. I have a name/phone number tag stuck on the back of each device, but it doesn't show if the device is in a case.
My newest solution is mini medic alert tags which have the medical symbol on front, and then "Medical Device, my name, and my phone number" on the back. They attach with a ring to the zipper pull on my Ping meter and to the loop tab on my Tallygear case for my Dex G4. I saw these tags when I had to order a new info tag for my dog.
I got my tags at GoTags and this is the link:
They come in lots of colors. Mine are bright pink to match my pump and Dex. I ordered the mini size although they also come in a larger size. They are $7.95 each with no shipping charge. If you look around the web, you might find something cheaper. But I'm very happy with these and if they bring a lost device home to me, they'll be worth the money.