I don't even know where I should start with this I mean it has been a disaster since I got this thing installed in my vehicle. My truck hasn't run the same since and is currently in the shop because this device keeps shutting off my engine unwillingly. It is already expensive as it is having this thing in my vehicle and now that I am less than 30 days away of having this thing removed, it wants to start giving me failed BAC readings more often. They say when you get the device installed it shouldn't turn your car off... that is a lie, I have experienced it shutting off on me. Also they say that different scents in your car and perfumes and colognes can set the device off, that is all a way for them to get money out of you. THIS COMPANY IS A SCAM AND I WOULD HIGHLY NOT RECOMMEND!