The cover fits just right over the fob. The fob had broken from the top and was separated from the key. So now the key is complete. I don’t have to carry two pieces works. Come previsto, i bought this to protect my spare remote to my daughter’s car. Those keys sit in the bottom of my purse and take quite a beating. This cover does the job beautifully, and now i don’t worry about cracking the plastic casing.