【Portable Design】 This professional breathalyzer requires only a small space and can be easily carried in your purse or pocket. Perfect for weddings, parties, celebrations, or events. Other social activities to make sure you drink after driving safely. 【Easy to Use】 Simply press the power button for 2 seconds to start the professional breathalyzer, wait 15 seconds to warm up, then blow into the tester for 5 seconds, after 3 seconds the result will be displayed for 15 seconds on the LCD screen. 【With Backlit LCD】 Night display gives you professional precision for safe driving. Automatically turns off the breathalyzer 5 seconds after the test is completed to save power. 【High-Precision Digital Breath Analyzer】 Uses advanced semiconductor sensors to ensure accurate readings in a short time. 【Detection Range】 0.00-0.19% BAC (0.0-1.9g/L), fast detection results, quick response, and quick recovery.