sensor: advanced 5.0 sensitivity sensor delivers accurate and quick BAC results in about 5 seconds. Measurement range 0.000.19% BAC with accuracy of 0.01% BAC and 99.9% resolution for reliable readings to help you make informed decisions about your driving safety. Innovative smart design: mouthpiece storage inside the battery compartment keeps it clean and protected when not in use. Builtin mini flashlight provides enhanced visibility in dark environments, making this breathalyzer practical for nighttime or lowlight situations when you need to check your alcohol levels. Compact and portable: weighs 60 grams with dimensions of 98 x 47 x 23 mm, pocketsized and easy to carry in purses, glove compartments, or pockets. Take it anywhere parties, dinners, gatherings or social events where you might need to monitor your alcohol consumption before driving home. Userfriendly operation: requires three AAA batteries (not included), attach the nozzle, and press the start button. After a 10second warmup countdown, blow steadily into the device for five seconds to obtain immediate blood alcohol concentration results on the clear LCD display. Use scenario: after a night out, check your BAC to determine if you are safe to drive home. Use scenario: during a dinner with friends, monitor your alcohol level before deciding to drive. Use scenario: at parties or social events, quickly verify your BAC to manage consumption and travel plans.