Easy to use: The alcohol tester features advanced sensors for precise measurement of alcohol content. Simply blow for 4–5 seconds, and your BAC results will appear within 3 seconds on a bright, easy-to-read LCD screen. Fast and precise: Utilizes a sensitive semiconductor sensor to accurately display the alcohol content in the human body. Provides quick and reliable results after drinking. Measuring range: The device has an alcohol measurement range of 0.00–0.20% BAC. Once the maximum value (0.20% BAC) is reached, the reading will not increase further, even with higher alcohol consumption. For best results, test three times consecutively and calculate the average value. Portable and energy-saving: Compact design takes up minimal space and can be easily carried in a bag or pocket. The device automatically powers off 10 seconds after the test to conserve battery. Includes a battery level indicator for convenient monitoring.