I have and install the Viper full featured 2 way paging remote start alarm, the alarm pages you up to a quarter of a mile away, keep your car cooled off before you get in it. the alarms are brand new in the box, they include,

:viper 791 xv(brand new in box)
:remote start
:starter kill
:keyless entry
paging remote
:130db siren

$450 installed most vehicles.