I got in on a black friday deal.
I have no idea how often they have the sale I do not work for BestBuy or the remote start company just a guy that purchased one.
It gets around having to burn one of your keys with a card that is in the remote start system so its just an electronic version and I would guess uses up one of your slots on max number of keys.
Yes you have to insert your key to drive off. You put key in and turn it 2 clicks and DO NOT TRY TO TURN IT TO START or you will grind your starter gear dont ask me how I know

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If you want to leave your car running for a quick stop for coffee or leave your dog in the AC you can while the car is running with your key in the ignition just press the remote start button and remove your keys it will stay running.
When you have used the remote start your real key buttons will not unlock the car as the car is using the fake transponder so will not take your real keys command.
Yes the buttons on the remote start fob will work anytime and if you want to pay BestBuy to connect it for other functions you can. My installer said he could rig the trunk button to roll down the windows ect but it would be expensive for all the custom work and parts. could he really do it I do not know and the range on the remote start fob is HUGE. I have had it work at way more than double the factory fob. I would guess 1 1/2 to 2 football fields.
My remote start fob is set to unlock all doors with one push. he said with custom work it could be made to work like the factory remote. I was not interested.
I will warn you he said it was a 3-4 hour install and it took 6 1/2 if I remember right. I live in the boonies so did not want to make someone drive me 1 1/2 hours to drop the car then drive home and back again. I wandered the mall for 4 hours then stared at the installer for the last 2 1/2
