There is an option for BMW's Mini Cooper that will tell you how long your convertible top has been down. It is called the openometer and it keeps track of the minutes and hours that you have your top down. At the other end of the spectrum, the Rolls Royce Phantom Coupe has a feature that creates the illusion of a convertible at night. Hand sewn into the headlining are 1600 fiber optic lights that create the illusion of a starry night overhead.