Much is expected of the modern car key fob. It should be small enough to fit comfortably in a pocket, its buttons should give a reassuring “click” when pressed and, most importantly, it should open the car door when required – especially in the airport long-stay car park in the pouring rain. Above all else, the key fob needs to operate reliably when used, often several times a day over the life of the car, for up to several years. Along the way the device is likely to suffer no small amount of abuse – being thrown around, soaked in the rain, or maybe even going through the washing machine!