Cobra immobiliser

I know this maybe not actual Micra specific, as an aftermarket alarm.
When purchased my other Micra pre facelift in January, it came with 2 immobiliser dashboard fobs just like in the link below, no other fobs issued.

Now, 1 stopped working, so down to sole working fob, which I am keen to programme in another spare before the sole one goes wrong.
I think the alarm is a cobra, but I am unsure as fobs have no markings, how can I find out what alarm it is, generally where is the given they place the consoles or can be anywhere in the vehicle?