This portable breathalyzer uses profeional airway design and high precision semiconductor sensor. It can quickly and accurately detect blood alcohol level in your body in seconds, to provide you high-precision test results. Features: Use high precision and sensitive semiconductor sensor. The breathalyzer test rating is adjustable with 6 common-used units (%BAC-US, g/l-EU, mg/L-JP, mg/100ml-CN, BAC-RU, prom-PL). According to the test result, he backlight will change colors among green, yellow and red. Up to 32 recent testing records for your checking. It will auto power-off to save power after finishing the test for 5 seconds. It is easy to carry, available for Friends gathering, company reunions, family reunion, wherever you go, do not drive after drinking. Specifications: Color: Black Material: ABS Range: 0.000-0.190%BAC, 0.000-1.90BAC, 0.000-1.90g/l, 0.000-0.95mg/L, 0-190mg/100ml, 0.000-1.9prom Alarming: 0.05%BAC, 0.5BAC, 0.5g/l, 0.25mg/L, 50mg/100ml, 0.5prom Accuracy: 0.01%BAC, 0.1BAC, 0.05mg/L Blowing Time: 5s Display: LCD Display with backlight Current Consumption: working current 180mA Quiescent Current: 40A Environmental Temperature: -10~50 Environmental Humidity: 95% NO dews Battery Expectancy Time: 300 Power Input: 31.5V AAA alkaline battery (Battery is not included) Item Size: Approx. 112 * 55 * 19mm / 4.4 * 2.2 * 0.75in(L*W*H) Item Weight: Approx. 59g / 2.12oz Package Weight: 123g / 4.33oz Package Size: 15.3 * 9.7 * 4.8cm / 6.1 * 3.8 * 1.9in Package List: 1 * Alcohol Tester 5 * Mouthpiece 1 * Tester Bag 1 * Instruction Manual (English) NOTE: In order to make the test results accurately, please test with the alcohol breathalyzer 20 minutes later after drinking; please wait for another 3 minutes before starting the next test to get the precise testing result.