Easy to use portable breathing gas analyser: simply turn on the alcohol breath analyzer, insert the mouthpiece, wait 10 seconds to warm up, just blow for 3-5 seconds to get an accurate reading, your BAC results will be displayed on the LCD screen of the breath analyzer on a bright screen. Remember to wait 20 minutes after drinking to get the most accurate results. Upgrade Latest MEMS SensorThe breath alcohol meter has an additional memory function that stores up to 50 sets of test results. Press and hold the button for 2 seconds when turning on the device to display the stored data. The display shows the serial number of the data and the corresponding concentration value. If no action is taken within 10 seconds, the indicator "OFF" flashes twice to turn off the device. Note: The subtitles of the device are displayed in English. Precise and sensitive: the alcohol tester adopts advanced semiconductor detection technology, which can maintain an accurate blood alcohol concentration, and you can quickly get a judgment result to determine whether you can drive or not. Blow time: 3-10 seconds. Response time: <5 seconds. Contactless breathalyser: Blower type, no need for contact more hygienic. Three-colour block and digital display, intuitive display of alcohol test results. Digital display, green colour for no alcohol consumption, red colour for drunk driving. Portable and compact: The lightweight alcohol tester can easily fit in your car, handbag, backpack or briefcase, space-saving, ideal for weddings, parties, banquets or other social events to ensure you drive safely after you drink. USB rechargeable, high capacity lithium battery lasts long after a full charge.