After Market Car Alarm

With all of the shit I have in my car I need an alarm that will go off when someone touches my window or something like that...


I would like to know, how hard is it to install an aftermarket alarm system on an eclipse?

Can someone also explain a shock sensor and all of the equiptment to watch out for, whats good?

what is the difference between a dual stage shock sensor and a regular shock sensor?

man I just stand next to the SS at the mall, then I heard the sound call " warning danger, stand back !! " man that some cool shit right their, I dint know what brand is that, viper ??