Sensitivity & High Precision: Featuring a high-precision semiconductor alcohol sensor, this breathalyzer delivers accurate results and activates an audible alarm when elevated alcohol levels are detected. Automatic Alarm Function: A caution symbol appears when alcohol concentration is between 0.02% BAC (or 0.2g/L) and 0.05% BAC (or 0.5g/L). A danger symbol and audible beep alert are triggered when alcohol concentration is 0.05% BAC (or 0.5g/L) or higher. Easy-to-Read LCD Display: The LCD screen provides clear readings, even in low-light conditions, displaying your alcohol level clearly. 12 Disposable Mouthpieces Included: The portable breathalyzer comes with 12 individual mouthpieces. These mouthpieces are hygienic and recommended for single use. Ideal for shared use among family or friends. Promotes safe driving and personal responsibility. Easy to Use: Press and hold the power button for 3 seconds to turn on the device. Wait 10 seconds for warm-up, then blow steadily into the mouthpiece for 35 seconds. Results appear on the LCD screen within seconds and remain visible for 15 seconds before the device automatically powers off. For best results, wait at least 20 minutes after drinking and perform 2 to 5 tests for consistent readings.