Easy-to-use portable breath gas analyzerJust switch on the alcohol breath analyzer, insert the mouthpiece. Wait 10 seconds to warm up, blow only for 3-5 seconds to get an accurate reading, your BAC results will be displayed on the breath analyzer's LCD screen on a bright display. Remember to wait 20 minutes after drinking for the most accurate results. Upgrading to the latest MEMS sensor The Breath Alcohol Meter features an additional memory function that stores up to 50 sets of test results. Press and hold the button for 2 seconds when you switch on the unit 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 "OFF" LED flashes twice to switch the unit off. Note: Device subtitles are displayed in English. Precise and sensitiveThe breathalyzer adopts advanced solid-state detection technology, which can maintain an accurate blood alcohol concentration and you can quickly get a judgmental result to determine whether you can drive or not. Discharge time: 3-10 seconds. Response time: < 5 seconds. Contactless breathalyzer: ventilation type, no need for hygienic contact. Digital display and tricolor block, intuitive display of alcohol test results. Digital display, green color for avoiding alcohol consumption, red color for drinking and driving. Portable and compact: the lightweight breathalyzer can be easily stored in your car, handbag, backpack or briefcase, taking up little space, ideal for weddings, parties, banquets or other social events, to ensure you drive safely after drinking. Rechargeable via USB, high-capacity lithium battery lasts long after a full charge.