Features: Using high-sensitivity semiconductor sensor, high measurement accuracy and strong anti-interference. Intelligent LCD screen display, 3 kinds of measurement units for you to choose, mg/100ml, mg/L and %BAC. Accurate measurement. When the measured value is higher than the dangerous value, the tester will display in red backlight and send out an alarm. With memory function, it is convenient for you to query the measured value. Intelligent exhalation interruption monitoring, easy to use. Built-in imported high-speed chips, stable performance and low power consumption. Powered by 3*AAA battery(not included), no need to recharge, more convenient.