High Accuracy : The breath alcohol tester is good to measure concentration of the alcohol in human body, this portable breathalyzer can quickly show a result to judge whether you can drive or not (only 5 seconds) with sensitive semi-conductor sensor.Energy Saving : Powered by 3AAA batteries( not included but commonly available), this breathalyzer will automatically shut off to save power after finishing the test for 5 seconds. you can test more than 200 times after you install batteries. Moreover, this breath alcohol tester is designed with low power indication.Large LCD Screen : This alcohol breathalyzer has a large LCD screen with blue background Light.Compact Design : This breath alcohol tester is lightweight and portable. Attached small cloth bag brings more convenience, put the breath tester in the bag, pocket-sized design is easy to take it with you everywhere you go. Your safety is our first priority.Smart MCU ControlThe system will automatically warm you once the test result is above 0.05%BAC or 0.50BAC or 0.25mg/L or 50mg/100ml. It can also be used to test breast-feed mothers to make sure they can feed their babies.