Semiconductor sensor type alcohol checker measures the concentration of alcohol during exhalation. Point 1: Just blow your breath! Easy measurements: 1. Press the power button. 2. Wait until the countdown end 3. In a 5 mm distance, gently blow the air vent for about 5 seconds. Point 2: Compact and convenient to carry: Slim type that fits in your hand. Point 3: Automatic power off function. Point 4: Battery replacement display function. Requires 2 AAA alkaline batteries (sold separately). ★Alcohol checks are required before and after driving. (Enforced from April 4) By visually checking the condition of the driver before and after driving, check whether the driver is getting saturated. Record or absence of liquor and keep the record for one year. From October 4: Use an alcohol detector to check whether the driver has been sake. Keep the alcohol detector always effective. The measurement data on this product is a material that determines whether or not the presence of alcohol, and does not determine whether or not the ability to drive or not.