Intelligent Alarm Function - Reminds you of the alcohol test results in 3 colors. Green means safe, yellow means warning, and red means danger. If the measured value is equal to or greater than the alarm concentration, the electronic ethyl tester will turn on a red light and send a quick prompt tone at the same time. Safe and hygienic - This electronic ethyl test does not require lip contact, just blow directly into the air nozzle. You do not need to use a blowtorch (the blowtorch can multiply bacteria), which reduces direct contact and makes the test more hygienic. Compact and portable - The portable mini auto alcohol test is small enough to fit easily in your pocket, hang on a key fob or keep in your car. Carry it everywhere with you to ensure your safety and that of your family. USB Charging - The electronic ethylotest can be easily charged by a USB data cable, and can also be charged by a mobile phone charger or computer USB port. Easy to use - Meticulous police breathalyzer, please press and hold the power switch for 2 seconds to turn on the breathalyzer. Ask them to wait for 10 seconds to warm up. Blow air for 5 to 10 seconds, the result will appear in seconds and the LED screen will display for 10 seconds. Test range: 0.00-0.19% BAC (0-1.9g/l), Measuring unit: mg/l (BrAC) mg/ml (BAC), g/l is the Chinese standard unit,% BAC is the American standard unit. Use battery: 3.7V/200MAH, can continuously measure alcohol 150 times, working temperature: 0-45 , preheating time: 10 seconds, blowing time: within 10 seconds, more than 4 seconds required, reaction time: less than 5 seconds