I've been a Dex user for about two years and the screen on the receiver can be easily scratched if you don't have it in a case. I found a company that manufactures screen protectors for it and I just applied it to my Dexcom. It was pretty easy to apply and fit well. If anyone is interested, search for: "Dexcom G4 High quality Screen Protector" on eBay. They're about $10 and, I think, worth it in order to keep the screen in good condition.