Re: X1 or Arc AAA for my wife\'s keychain??
Arc AAA,
I don't have one as my Micro does the job for me...anyway, the Arc AAA would be better in that it is much, much, much smaller compared to the X1. The X1 will use an AA battery and the tailswitch and optics make it much longer and larger in diamter.
If you want to get her a single 5mm LED that uses an AA battery, the Arc AA seems to be the one. Heck, buy both the AA and AAA and see which one she likes.