It happened so frequently - my night is winding down and I am getting distracted as I go through my internal debate: drive home or find a place to crash. I had to think back, calculating number of drinks and time passed. Well not any more! BACtrack allows me to track my blood alcohol quickly, easily and accurately. No more guessing, just an easy decision at the end of the night. My friends, of course, love it too. And, over probably 130 uses now, the BACtrack has not given me one wack reading, nor any trouble syncing with my phone. Get assurance, get BACtrack!