Accurate Detection & Fast Results: Breathalyzer uses a new generation of high-precision nanosensors that can detect blood alcohol concentration (BAC) from 0.000% to 0.400% with an accuracy of three decimal places. Whether you are detecting trace amounts of alcohol or higher concentrations, you can quickly get reliable results in seconds. Three-Color Warning System: The alcohol breathalyzer uses an IPS high-definition display and an easy-to-read three-color warning system (Green: safe, Yellow: caution, Red: danger), which allows you to clearly understand your blood alcohol concentration (BAC) status at a glance even when you are unconscious. Smart Sobering Time Reminder: Insert the mouthpiece, press and hold the start button, press the button again when the screen lights up, and when the screen displays "BLOW", take a deep breath and blow for 5 seconds to quickly get the test result. The breathalyzer for alcohol will also intelligently estimate when BAC can drop to 0.00%, helping you scientifically control the awake time. USB Rechargeable & Ultra-Portable: Built-in rechargeable battery, can be charged through any USB port, no need to replace the battery. Weighing only 190 grams, the lightweight design can be easily put into pockets, bags, cars, and even carried as a keychain. Includes 10 Replaceable Mouthpieces: The alcohol tester comes with 10 washable and reusable mouthpieces, made of safe food-grade PP material, ensuring hygiene whether you are testing alone or sharing with friends. Perfect for personal use, family gatherings, social events and other occasions.