【Portable Design】 This professional breathalyzer is compact and easily fits in your purse or pocket. Perfect for weddings, parties, celebrations, or any event where you want to ensure safe driving after drinking. 【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. The result will be displayed on the LCD screen after 3 seconds for 15 seconds. 【Backlit LCD】 Night display provides professional precision for safe driving. Automatically shuts 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), providing quick detection results, fast response, and rapid recovery.