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: This alcohol tester uses a sensitive semiconductor sensor to accurately display the alcohol content in the human body. After drinking, you can quickly measure your alcohol level with reliable accuracy. Measuring range: This device has an alcohol detection 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, perform three consecutive tests and calculate the average. Portable and energy-saving: This compact breathalyzer takes up minimal space and can be easily carried in a pocket, handbag, or purse. It automatically powers off 10 seconds after each test to conserve battery life. Additionally, it includes a battery level indicator for convenient monitoring.