Never heard of a LiteXpressTacticalSwitch LXA100. What I am indeed aware of are click rear ends. No need to adjust the focus every time you turn it on. I have 3 AA mini Mags the on off switch at the tail has made the light much more useful and mainly FUN. I am going to check out LiteXpress. Will be back.
BACK! LiteXpress are selling Surefire knockoffs, Eagtac knockoffs and even Fenix knockoffs. Avoid. Just go to evil bay and search AA Mini Mag tail switches and you should come out fine. That is what happened with me. I just focused the beam as well as I could. The only thing you will be removing is the tail cap. The click switch screws right on perfectly. No more twisting to turn it on and off let alone having to focus the beam all over again.
I took 5 pictures of my awesome olive drab green yet do not know how to post much of anything on this crazy Apple gear. If I can finally figure it out I will post them up here. Use Energizer AA cells. They give a little bit more juice to the emitter.