4.Fast & Accurate: The Alcohol Breath Analyzer uses a sensitive semiconductor sensor that can accurately display the alcohol content in your body. Use this breathalyzer to quickly measure your alcohol level after drinking.2. Alcohol tester Measurement range: The alcohol measurement range is 0.00-0.20% BAC. The alcohol test result reaches the maximum value (0.20% BAC), and the value will not increase. the test result still shows 0.20% BAC.High-precision sensing & overvoltage protection for anti-burning Automatic shutdown after not in use Performance upgrade, more durable5. What do you get? Alcohol Breath Analyzer and Instructions Good 24-hour service, 1-year warranty, lifetime technical support. You are welcome to contact us anytime if you have any questions1. Simple operation: click the power button to start, enter the preheating mode, wait for 10 seconds, use the alcohol tester to blow for 5 seconds, and the result will be displayed on the LCD screen after 3 seconds. (The product does not contain batteries). The device will automatically shut down after 60 seconds of stopping use to save power. You can press switch buttons for 5 seconds to shut down3. Lightweight and portable: The product weighs only 40 grams and can be easily carried in a wallet or pocket without taking up space. Perfect for weddings, parties, banquets or other social events to ensure you are safe while drinking and driving.