Simple Operation, Auto-Off: This breathalyzer is easy to use. Simply insert three AAA batteries (not included), turn on the power, and you're ready to test. Press and hold the switch for 1 second and the device will cycle through warming up (20 seconds), blowing, and displaying the results. The LCD screen displays the results for about 10 seconds before automatically shutting off. It also allows for unit conversions and custom BAC thresholds.Accurate and Reliable Testing: Equipped with a high-precision semiconductor alcohol sensor, this breathalyzer quickly provides accurate results to help you determine your ability to drive safely. Trust our professional-grade tester to provide reliable answers.Large LCD Display and Alerts: The tester is equipped with a large LCD screen for easy reading of test results and battery status. It includes an alert system for BAC levels exceeding safe driving limits and automatically shuts off after 20 seconds of inactivity to save energy.Versatile Uses: This breathalyzer is ideal for safe driving, home use, and personal monitoring. It's also valuable for professional environments, including workplace safety inspections and law enforcement applications. Perfect for self-testing and education programs to ensure responsible drinking and accurate BAC measurements in a variety of situationsEnergy-saving design: It has an advanced flat alcohol sensor that responds quickly. The alcohol tester is designed to save power and indicate low voltage. After testing, it will automatically sleep for 5 seconds.