【Portable Design】 This professional breathalyzer requires minimal space and easily fits in a purse or pocket. Perfect for weddings, parties, celebrations, or any social event where you need 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. After 3 seconds, the result will be displayed on the LCD screen for 15 seconds. 【Backlit LCD】 Night display provides professional precision for safe driving. The breathalyzer automatically shuts off 5 seconds after the test to conserve power. 【High-Precision Digital Breathalyzer】 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 rapid recovery.