Bee: If you add a second Photon and switch out the LM Micra for a Squirt S4 and different car manufacturer, you'd have my set-up. I find the micro carabineer is smaller and more versatile than a key ring. The set is a little bulky for dress pants pockets but fine for others.

Some people say that the weight is too much for vehicle ignition systems but I have'nt had any problems. [knock on wood].