i have had vipers in the past, and they are good, but i have stepped up to compustar which is a more costly one, but i can use my smartphone to start, set heated seats on/off, check indoor temp and several more features, but i have $900 into it on my denali pickup and it has a true 1 mile range with the lcd readout 2 way remote or i can start it with my phone on the other side of the planet, it freaked my neighbors out when they were watching our house when we were in mexico and i would start it up every couple of days when temps dropped below 10F