Having recently become part of a two-car family, and being reluctant to walk about with a huge set of jangling keys, I find I’m often now carrying around the wrong set.
Today’s invention allows you to carry two such carkeys without having to also carry two grips (or bows).
Instead there would be one grip (yellow), packed with the required electronics and battery to allow opening of either of one’s two vehicles remotely.
There would also be a sliding piece of metal comprising a key blade at each end so that only one of these would be exposed at once (lessening the damage to one’s pockets).
For added security, the double blade could be locked with only half of each poking out, making stealing either car harder.