High Accuracy and Fast SensorThe alcohol tester comes with professional airway design and high accuracy semiconductor sensor. Accurately display blood alcohol content quickly. Then you can decide to drive after drinking. Easy to use Simply insert the three 1.5V AAA batteries, then connect a mouthpiece, press the start button for the count to initialization countdown, warm up for 10 seconds, blow into the inhaler for 5-10 seconds, the blue backlit LCD will show the test result directly. After the result is displayed, you can press the power button to change the unit. Auto alarm function and power saving modeThere are 3 measurement units to choose from, % BAC, BAC, mg/L, when test is performed, if the measurement result exceeds 0.5 BAC, the breathalyzer will warn with an audible alarm. The breathalyzer automatically shuts off to save power when no operation. Compact and portable designThe alcohol analyzer in mini size, small enough to fit in your car, purse, backpack or briefcase. It is convenient to have a portable bag, it can perfectly hold the breathalyzer and mouthpieces when you are anywhere. 20 Hygienic and Replaceable MouthpiecesThe breathalyzer is comes with 20 mouthpieces to change, which can be cleaned and recycled.