One-button operation: The breathalyzer is extremely easy to use. Simply insert the three 1.5V AAA batteries, press the power button for 1 second to turn on the alcohol tester, perform a 10 second warm-up, blow into the inhaler for 5-10 seconds, the Blue backlit LCD display shows the test result directly. .The third measurement is the most accurate. Compact and portable design: The alcohol analyzer With mini size, small enough to put in your car, purse, backpack or your briefcase, making it easy to take anywhere you go. Fast and High Accuracy Sensor: Alcohol tester with advanced semiconductor sensor technology, you can get the precise concentration of alcohol in the blood, then judge whether or not he can drive. 3 UNIT OF MEASUREMENT: There are 3 units of measurement to choose from, % BAC, BAC, mg/l, When 'after drinking, it is recommended to wait 20 minutes before taking a test, this is because 20 minutes is approximately for the blood alcohol of the digestive organs. Please wait at least 3 minutes for