AccuBAC Digital Breathalyzer Alcohol Tester Most Accurate Semiconductor-oxide Breathalyzer on the market Automatic flow detection to monitor the continuous breath sampling Automatic Calibration Technology -- Resets itself before each use Large LCD & 3 decimal points display (eg. 0.023%BAC 2 Detachable Mouthpiece included -- Power Input: 3 X AAA Alkaline battery (Not included)