Powered by BACtrack's proprietary BluFire® fuel cell sensor technology, the ultra-compact BACtrack C8 personal breathalyzer quickly and easily estimates your alcohol level, with professional-grade accuracy. Want to know when you'll be sober? BACtrack's patented ZeroLine® technology tells you when your BAC will return to 0.00%, empowering you to make better decisions while drinking. The free BACtrack App, paired with power of your Apple iPhone, Samsung or Google brand Android smartphone, unlocks a variety of additional BACtrack features that raise your drinking IQ. You can Guess Your BAC, track your results over time, and you can even call an Uber directly from the App if you've had too much. Perfect for any social situation, from happy hour to dinner parties, the tiny BACtrack C8 portable breath alcohol tester will help you and your friends drink smarter.