I love the Model S key, but it's an awesome example of form over function. Although I've not lost one yet, my local SC reports that many owners have. I saw this link last night, and it looks like an interesting solution to helping find lost keys: Home | StickNFind - Home of the StickNFind, StickNFind Pro, and MeterPlug I've no affiliation with the company, and haven't (yet) used the product, but I'll probably buy a few to try out. Either way, looks interesting. There's another option, Tile, which looks even smarter, but it's not out until the end of the year.