1、Easy to Use: Turn on the power button of the breath tester, wait for 15 seconds to preheat, and then blow evenly for 3-5 seconds. The results will be displayed on the LCD screen for 5 seconds. 2、High Accuracy: This breath detector uses high accuracy semiconductor breath sensor to monitor your blood content to ensure that you can drive normally. 3、Smart Warning: After use, when the test result is below 0.05% BAC, the green LED light will light up and there will be three short prompts. When the test result is greater than 0.05% BAC, the red LED lights up and emits three long tones. 4、Measurement Range: The measurement range is 0.00-0.20% BAC. The test result gets to the maximum value of 0.20% BAC, which will not increase. Even with an increase in alcohol consumption, the test results still showed 0.20% BAC. 5、The Using Tips: For more accurate test results, please stop drinking for 20 minutes and use the tester. The interval between each test should be kept between 2 to 3 minutes. To obtain more accurate results, please test 3 times every 2-3 minutes and take the average value. Item Type: Breath Tester Model: AD-6000NS Material: Plastic Measurement Range: 0.00-0.20% BAC, 0.00-2.00‰BAC, 0.00-2.00g/l, 0.00-1.00mg/l. 0.00-2.00‰ BAC in default. Alarm Level: 0.05% BAC, 0.5‰BAC, 0.5g/l, 0.25mg/l. Power Supply: 2 x AA dry battery, not included. 1 x Breath Tester 6 x Replaceable Mouth Piece 1 x User Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.