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, do 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 let's go. Fast and high precision sensor: alcohol tester with advanced solid-state sensor technology, you can get the precise concentration of alcohol in the blood, then judge whether he can drive or not. /l, When after drinking it is recommended to wait 20 minutes before taking a test, this is because 20 minutes corresponds approximately to the blood alcohol level of the digestive organs. Please wait at least 3 minutes to