This won't help you at all, Sorry, But just wanted to voice my opinion...
You should get the Viper Remote Start with Smart Start and pay for the subscription... It's not too pricey... I paid $850 installed + $200/3 years of the smart start service.
You can track your car through GPS, It sends you texts for anything that happens (Alarm goes off, Someone opened the door, Trunk, Hood, Etc.) so it's not like an alarm that just goes off to scare people or so when you come back all you know is something happened, You'll know right away so you can go check on it
The remote is 2-way so it gives you feedback as well, Like I said, A little pricier, But it's worth it.