1. Quick response: This alcohol tester uses a high-precision semiconductor alcohol sensor, it only takes 5 seconds to give the result to judge whether you can drive. 2. Easy to use: Just press the power button for 3-5 seconds to start the professional breathalyzer, wait for 40 seconds to warm up, then blow with the tester for 5 seconds, the result will be available after 3-5 seconds and will be in displayed on the LCD screen. 3. Portable and Lightweight: This professional alcohol breathalyzer requires only a small space and can be easily carried around in a purse or pocket. Perfect for weddings, parties, banquets, or other social events, make sure you drive safely after drinking. 4. Safe and hygienic: The alcohol test can be performed directly by exhaling, avoiding the ""inlet"" test, which is more hygienic. 5. Color high-definition screen display, the observation results are clearer