We knew a Tesla Model 3 key fob was coming thanks to an FCC application, now it's available to buy via the EV-maker's website for $150. Or at least it was -- the sleek, black clicker emblazoned with the Tesla logo has already sold out. But, as Electrek notes, the miniature device comes with a huge catch: it doesn't have "passive entry." That's the ability to unlock the vehicle by simply approaching it with the key on you. It's an odd omission considering why it came to be in the first place.