1High Accuracy and High Sensitivity: Breath tester can accurately detect the drinks concentration in the exhaled air, helping users determine whether they are suitable for driving or other activities that require alertness. It can quickly inform users whether they have exceeded the drinks driving standards, remind them to comply with the law, and ensure individual traffic safety. 2Energy Saving and Automatic Shutdown: Powered by 2 AAA batteries (not included, but generally available), the portable breath tester will automatically shut down 5 seconds after completing the test to save power. Each time the battery is installed, it can be tested more than 200 times. 3Digital Display Screen: The digital breath tester adopts a digital display screen, which can visually and clearly display the drinks concentration value, avoiding the inaccurate problem of traditional exhalation testers needing to visually detect color changes to determine drinks concentration. Users only need to exhale briefly to obtain accurate test results. 4Fashionable Keychain Design: This portable digital breath tester is both space saving and lightweight. It is easy to hold and carry. Pocket size allows you to carry it anytime, anywhere, ensuring safe driving under the influence of drinks. 5Large Digital LCD Display Screen: This breath tester has a large LCD screen with an orange background light. It's convenient for you to breathe with this drinks at night.