honestly mang, I think these "responder" type alarms are dangerous. I mean, all they do is put you in harms way. If you're in a resturaunt(sp?) and your 2way remote starts going off, you're gonna get up and run outside to see what's up w/your car right? Now what if the dude has a gun and you confront him, napking still tucked in your shirt? I'd rather pay the extra $$$ and get something I know will prevent theft. When you compare the features of the concept 600 to those of a Matrix RS3 or Viper 790x, it's painfully obvious which would better protect ur car.