1. Press and hold the power button for 1 second, the alcohol tester LCD with turn on with one beep sound.
2. Warm-up mode countdown for 10 seconds.
3. Testing mode countdown from 10 to 00 after warm-up mode, blow at this period.
4. Blow into the breath inhaler for 3-5 seconds with normal power after a deep inhalation.
5. Read the test result from the alcohol tester LCD.
6. Test range: 0.00%-0.19% BAC & 0.0-1.9 g/L