Function: 1 . Contactless blowing: The alcohol breathalyzer adopts non-contact blowing, with quick control, healthier measurement 2. 3. 3-color indicator light: the alcohol detector indicator light shows the test results in 3 colors according to different alcohol solubility test results, the alcohol results are clear at a glance 4. Accurate Value: The alcohol tester is displayed on the high definition LCD screen with accurate values, there are two units, mg / l and% BAC, which are clear, simple and easy to read 5. Scientific filtration: Alcohol detector can exclude other gases and retain alcohol, provides more accurate detection 6. Built-in rechargeable battery: The alcohol detector has a built-in high-capacity rechargeable lithium polymer battery, which can be used about 300 times when charged, and the universal USB charging port is more convenient 7. Small and Portable: The alcohol detector is small and portable, it doesn't take up any space, the whole machine is light and easy to carry in a backpack Specification: Item type: Non-contact breathalyzer Material : ABS Measuring range: 0.000-0.199% BAC, 0-0.999 mg / L Charging voltage: DC 5V Warm-up time: 10s Exhalation time: within 10s Response time: within 5s Switch-off time: 40 s after measurement Operating temperature range: 0 ℃ to 45 ℃ Storage temperature range: -20 ℃ to 50 ℃ Battery type: 1x502030 polymer lithium battery 200mAH (built-in) Package List: 1 x non-contact breathalyzer, 1 x data cable 1 x Manual 1 . Press the button for 1 second to turn on, the backlight and the display screen will light at the same time, display all content, and there will be a beep to prompt. 2. The display screen will show "Warm up" and a 10 second countdown, when the countdown is complete, a beep will sound and it will go to the next step. 3. The display screen will show "Blow" and countdown 10 seconds, blow to the blowing site for 3-5 seconds, after the countdown is finished, you will hear a beep, the test result will be displayed in two units% BAC and g / L. 4. When the test result is less than 0.02% BAC, the green indicator light is always on. 5. When the test result is greater than or equal to 0.02% BAC and less than 0.05% BAC, the yellow indicator light is always on, the "Attention" icon on the display screen flashes, and a slow beep is heard. 6. When the test result is greater than or equal to 0.05% BAC, the red indicator light is always on, the “Danger” icon on the display screen flashes and a quick beep is heard. The test results show a time of 10 seconds.