Feature:1. An instrument for analyzing the concentration of alcohol in the blood anytime, anywhere.2. Non‑contact use, no need to accompany the breathing port, more convenient to use.3. The breath alcohol tester uses nano semiconductor alcohol sensors to quickly and accurately detect the breath of alcohol.4. The test value is directly displayed on the LCD, and the reading is convenient and simple.5. Breathalyzer can alarm by sound and light, and automatically shut down: about 1 minute.How to Use:1) Alcohol tester part:1. Press the POWER button, and the tester "B" will sound, and the LCD will display"Warm UP" at the same time countdown "10.. 09.. 01"2. After the sound of "B", LCD displays "Blow" and countdown at the same time"Ten.. 09.. 01 ", blow at any time of the reciprocal here, hear "B"Stop blowing after one sound and wait for the test results.3. When the test value is less than or equal to 0.02, LCD displays: "Result""0.0 % BAC" and "0. g/I";4. When 0.02s display value <0.05, LCD display: "RESULT"C%BAC 0.g/I 0.g/I 0.g/I 0.5. When the display value of 0.05 s LCD display: "RESULT40. % BAC" g / 1", "DANGER"