1、HIGH ACCURACY: Alcohol detector uses high accuracy semiconductor alcohol sensors to monitor your blood alcohol content to ensure that you can drive responsibly. 2、NOTE: For more accurate test results, please stop drinking for 20 minutes before using an alcohol tester. The interval between each test should be kept at 2 to 3 minutes. 3、EASY TO USE: Turn on the power button of the alcohol tester, wait for 10 seconds to preheat, and then blow evenly for 3 to 5 seconds. The results will be displayed on the LCD screen for 5 seconds. 4、MEASURING RANGE: Alcohol measurement range is 0.00 to 0.19% BAC and 0.00 to 0.99mg/l, and the alcohol test result reaches the maximum value (0.19% BAC), which will not increase. Even with an increase in alcohol consumption, the test results still showed 0.19% BAC. 5、AUTOMATIC SHUTDOWN: In any state, you can press and hold the button for 0.5 seconds to directly shut down, or the tester will automatically shut down 30 seconds after displaying the test results.