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 useJust insert the three 1.5V AAA batteries, then connect a mouthpiece, press the start button for initialization countdown , warm up for 10 seconds, blow into the inhaler for 5-10 seconds, the blue backlight LCD will show the test result directly. After the result is displayed, you can press the power button to switch the unit .battery not included Auto alarm function and power saving mode There are 3 measurement units to choose from, % BAC, BAC, mg/L, when the test is done, 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. handbag, backpack or briefcase. It is convenient to have a portable bag, it can perfectly hold the breathalyzer and mouthpieces when you are anywhere. 16 Hygienic and Replaceable MouthpiecesThe breathalyzer comes with 16 mouthpiece mouthpieces to change, which can be cleaned and recycled. Power supply 3 AAA batteries, 1 alcohol tester, 1 user manual, 1 storage bag. And we put everything in a gift box, it is a perfect gift for your friends. Product size: 112*61*29mm Product color: black Delivery quantity: One piece