1Accurate Testing: The alcohol tester adopts a semiconductor gas sensor to provide high accuracy detection, and accurately feedback the actual alcohol concentration on the LCD screen. 2Measurement Range: The breath analyzer is blowing type, equipped with 5 mouthpieces, convenient and practical. The alcohol concentration measurement range is 00.20%BAC, which meets most requirements. 3Convenient to Use: This digital breath analyzer provides 4 measurement units, suitable for different scenarios. Featuring a portable size and lightweight design, it is convenient to use anytime, anywhere. 4Power Supply: This portable alcohol checker is powered by 3 AAA batteries (not included), which is environment friendly and energy saving. It supports USB interface charging and provides power display. 5Usage Steps: Press the power button to start the tester, preheat for 110 seconds, and automatically enter the blowing detection countdown after completion, waiting for the test results to be displayed. 1 x Portable Alcohol Tester 5 x Mouthpieces 1 x User Manual