I bought this product a month ago and only opened it up this week, after the first few tries it started failing 3 times out of 5 and gave random BAC readings. Disappointed.
I've had this thing on my keychain for over a month. It works well, still on original battery. Only problem so far is the little bit of plastic that covers the readout came off. Doesn't seem to effect unit in any way. A note on use, you will get an elevated reading if you take a drink just before using, so clear your pallete
I have always been a responsible drinker. I recently bought this item just cause i thought it was cool and that it would be a great tool to keep myself and my friends even more responsible. I use it every time i got out for drinks. I may feel in great shape to drive but this makes sure i am. Everyone who likes to go out for drinks should have one of these. It works great it looks great too in its different colors. I can not recommend it highly enough!!!