ive had the device a couple of mo with only minor problems on dec 5th around 4 oclock i was going to town and started my veheicle with a pass of corse and got going down the rd then it goes off wanting a test did so came back as a violation gave another test a few mins later and passed and then have warning test after have to go get it checked with in for days but this is a inconvence i passed then i didnt passed then i didnt its not my fault please take care of this matter,i dont need this thing maufuntioning like this and exspecailly the money it cost to have it checked out like i said dont make me pay because your machine malfuntioned thank you