HYGIENE AND CONTACTLESS TESTING: Designed for contactless use, this certified alcohol tester is perfect for both personal use and sharing with others, always ensuring cleanliness and ease of use.Professional and accurate measurement: The breathalyzer is one of the most reliable breathalyzers on the market, using advanced technology to provide accurate blood alcohol concentration (BAC) measurements in seconds. Please note: This product is not intended to determine whether a person is driving under the influence of alcohol.USB rechargeable breathalyzer: The portable breathalyzer features a built-in 300 mAh -capacity battery; no battery replacement is necessary; simply charge it directly by connecting it to a car charger, computer, etc. via a USB charging cable. After a full charge, it can be used approximately 300 times. (Note: If the battery is low, the product may not function properly; please charge it before using it for the first time.)Compact and portable design: The portable breathalyzer has a portable design and can be Easily fits in your pocket or bag. Perfect for parties, car rides, or after-meal drinking. An essential tool for testing alcohol anytime, anywhere.Smart Alarm: Displays three statuses based on the test results: 1. "Undrinkable Water": The LED indicator lights green and no sound; 2. "Drinkable Water": The LED indicator lights yellow and a beep sounds; 3. "Drunk": The LED indicator lights red and a beep sounds.