I had been researching remote start unit for a while and came across this company on Amazon. I was eventually getting mildly overwhelmed with all the choices of modules and devices I would need for our 2004 Envoy. I finally decided on finding a unit that was all-in-one to take the guess work out of the installation. This remote start unit made things much easier for the task. If you have never installed a remote starter, I recommend reading the instructions and researching the installation as much as possible. It greatly aided me in installing this unit. Everything came cleanly packaged with all the materials needed for the install. If you are able to find the appropriate unit for your vehicle, I recommend getting it!