We just got it installed- beeped most of the way home. Next day, did the exact breathing and truck won't start now. Called the CS #- which by the way is INCORRECT ON THE DEVICE!?!- 1st lady barely spoke english, had no clue how to help us... called another # and she informed us that it's probably defective and that we'd need TO TOW THE TRUCK BACK TO THE SHOP WHERE IT WAS INSTALLED!? After she had me disconnect it simply by unscrewing it and waiting 20 seconds. Her first sentence to me was, don't worry I'll have it running within half hour... she said the message "try again and breathe harder" means it's probably defective. We have to pay for the tow and a new install and then " they'd reimburse us"!?! There has to be an alternative company that makes a similar device! Awful to put people through the stress. I will be contacting the state of MN to get answers ASAP.