This alcohol tester is designed for an aid to promote reasonable driving. It should not be used in anticipation of the use or operation of vehicles, machinery, or equipment. 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). ALARMING values can be set by users based on your own need. 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, avaliable 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. 12.5 * 6.5 * 2.4cm / 5 * 2.4 * 1in(L*W*H) Item Weight: Approx. 83g / 2.95oz Package Weight: 200g / 7.14oz Package Size: 15.3 * 9.7 * 4.8cm / 6.1 * 3.8 * 1.9in Package List: 1 * Alcohol Tester 1 * Lanyard 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.