[Smart Alarm Function]: Reminds you of blood alcohol test results in 3 colors. Green means safe, yellow means warning and red means danger. If the measured value is equal to or higher than the alarm concentration, the electronic breathalyzer turns on a red light and at the same time sends out a prompt prompt tone.[Safe and Hygienic]: This electronic etilotester does not require lip contact, just blow directly into the air nozzle. You don't need to use a blowtorch (the blowtorch can multiply bacteria), which reduces direct contact and makes the test more hygienic.[Compact and Portable]: Mini portable alcohol self test is small enough to easily fit in your pocket, hang on a key ring or keep in your car. Take it with you everywhere to ensure your safety and that of your family.[USB Charging]: The electronic breathalyzer can be easily charged by USB data cable, and can also be charged by 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 10 seconds to warm up. Blow air for 5-10 seconds, the result will appear in seconds, and the LED screen will display for 10 seconds.