AT808 is a new brand alcohol tester we developed (here under referred to as the device). The device is equipped with an advanced fuel cell sensor that has good sensitivity, accuracy, and repeatability. Its large LCD screen and anti-backflow mouthpiece provide the user with an experience of comfortable feeling and simple operation. With local record storage function, combined with the APP application, AT808 could meet the needs of must users. Those features of traceable test record, good accuracy and portability brings its user a more convenient and safer life.