HIGH ACCURACY: This alcohol detector uses high-accuracy semiconductor alcohol sensors to help monitor breath alcohol levels, promoting responsible behavior. NOTE: For more accurate results, avoid drinking for at least 20 minutes before testing. Allow 2 to 3 minutes between consecutive tests. EASY TO USE: Turn on the device, wait 10 seconds for preheating, then blow steadily for 3 to 5 seconds. Results appear on the LCD screen within seconds and remain visible for 5 seconds. MEASURING RANGE: Measures breath alcohol concentration from 0.00 to 0.19% BAC and 0.00 to 0.99 mg/L. The maximum displayed reading is 0.19% BAC; values above this threshold will not increase on screen. AUTOMATIC SHUTDOWN: Press and hold the button for 0.5 seconds to turn off manually, or the device will automatically power down 30 seconds after displaying results.