Powered by BACtrack's proprietary BluFire fuel cell sensor technology, the ultra-compact BACtrack C6 breathalyzer keychain quickly and easily estimates your alcohol level, with professional-grade accuracy. BACtrack's patented ZeroLine technology can even tell you when your BAC will return to 0.00%, empowering you to make better decisions while drinking. Perfect for any social situation, from happy hour to dinner parties, the tiny BACtrack C6 keychain breathalyzer will raise your drinking IQ, helping you and your friends drink smarter. BACtrack has created one of the best breathalyzer apps on the market. Pair your wireless breathalyzer or keychain breathalyzer to the free app and you will achieve much better results than a simple bac calculator. This home breathalyzer test (or alcohol breath analyzer) is also sometimes known as a blood alcohol tester or an at home breathalyzer. Whatever you call it, you know you're getting the most accurate results in the industry.