Professional Breath Tester What you get - 1 breathalyzer - 1 USB data cable - 1 user manual Why you need it - High sensitivity and high precision allow quick measurement of your alcohol level after drinking, so you can decide whether you are ready to drive. Precision and build - High precision: this alcohol tester is made of an advanced high-precision nanotechnology sensor to accurately measure the alcohol content in the blood. It can be used as a New Year gift and Christmas gift for family and friends. Ease of use - One button operation: the breathalyser has a single button. Press and hold the power button to turn on the device. Preheat for 10 seconds, then blow for 5 seconds. After you hear the beep, the test result is displayed. The indicator "off" flashes twice and the beep sounds twice to shut down. Portability and charging - Lightweight and portable: the portable promille meter is small and fits easily anywhere in your handbag or pocket. It comes with a USB cable that allows you to connect the alcohol tester to a USB port for quick charging. Ideal for weddings, parties, festivals or other social events to help you determine if you are ready to drive. Use scenarios - Before driving after social drinking at bars, dinners, or gatherings. - At weddings, parties, festivals or other events to check readiness to drive. - As a thoughtful holiday gift for family and friends.