Clear and fast BAC results: wide test range from 0.00% to 0.19% BAC with quick detection. Results appear on a digital screen with a blue backlight LCD and a prompt sound for easy reading. Hygienic and simple testing: press the button and wait 10 seconds for warmup, then blow for 35 seconds. The display provides your results, offering a clean and straightforward testing method. Easy to use and portable: features a simple onebutton operation and can be carried conveniently with a lanyard. Compact design fits in a pocket or purse. Requires 2 batteries (not included). Professional precision: advanced semiconductor sensor technology delivers accurate and reliable results within seconds. Large LCD screen with blue backlight enhances readability at night. Practical use scenarios: Before driving after consuming alcohol to assess safety. At dinner parties or social gatherings to estimate guests' or your own BAC. At home or on the go for quick, reliable alcohol level checks.