i have the viper alarm system with the gps smart start. i have the gps module hidden in the vehicle along with a small battery that keeps it powered for several days if the power gets cut. my alarm is connected to the gps module, but even if they disconnect the alarm or try to bypass whatever it is they are bypassing or unplugging, the battery power is connected in a different spot most likely not seen by the thief. so i can always track my truck if its stolen