Presenting the new Jaeger-LeCoultre AMVOX 2 Rapide Transponder.  From JLC:

The AMVOX 2 Rapide Transponder builds on the AMVOX2 Chronograph, first introduced in 2006. The Chronograph was a revolution in watchmaking, with a start, stop and reset mechanism operated by pushing on the sapphire crystal face of the watch; there are no push-buttons. The mechanism within the AMVOX2 is extraordinarily sophisticated, using 0.1mm diameter bearings to give mechanical feedback to the stop-start action using the dial.

A three-position cursor rounds off this revolutionary construction. Positioned on the side of the case at 9 o’clock, this selection device serves to lock either the whole set of chronograph controls or only the resetting device, thereby ensuring that the functions are not accidentally started, stopped or reset by the driver’s inadvertent hand or arm motions.

and the new Aston Martin Rapide:

The watch can be used to  lock, unlock, and locate the autombile:

Crafted exclusively for owners of the Aston Martin DBS and now for the Aston Martin Rapide, the AMVOX2 Transponder demonstrate the design and engineering collaboration between these two long-established companies; both leaders in their respective fields and partners since 2004.

The AMVOX2 Rapide Transponder incorporates a miniature transmitter system serving to lock and unlock Aston Martin Rapide, while maintaining the functions of the now famous vertical-trigger mechanism – the pushpiece-free chronograph. As the driver nears the car, all he need do is press the OPEN position on the watch glass (between 8 and 9 o’clock) in order to activate the door opening system, whereas doing the same thing on the CLOSE position between 3 and 4 o’clock will close the vehicle.

By pressing simultaneously on the “OPEN” and “CLOSE” rectangles, the watch emits a signal recognized by the car as a “find me” function: the headlamps light up for several seconds, without unlocking the car, so as to enable the owner to find the car at a glance.

Photos:  Aston Martin and Jaeger-LeCoultre.