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How to Choose a Replacement Car Key Fob Case A key fob case will protect your car's key fob from water damage. Key fob cases are waterproof linings on the both sides of the. They also prevent accidental press by increasing the pressure needed to trigger buttons. Many newer vehicles require the reprogramming. This can be costly, but they can be performed for less than at the local locksmith or dealer. Inner lining The lining of the replacement car key fob case is what protects the delicate circuitry of the device from