Thank you for viewing. This is a compact alcohol checker with a precise design, capable of highly accurate measurements. It is an alcohol checker equipped with a semiconductor gas sensor. - Brand: KING JIM - Model Name: TH-BAC10-BK - Power Supply: 2 AAA batteries (sold separately) - Included: 5 dedicated mouthpieces - How to Use: Turn it ON, wait 20 seconds, and then blow into it. Although it is new and unused, it has been opened for inspection. Due to packaging constraints, it will be shipped without the box. Since it has not been powered on, the operation has not been confirmed. How about it for year-end parties or the new school year? Alcohol checkers lose accuracy over a few years, so a new one is recommended.