Precaution: When after drinking, it is recommended to last after 20 minutes, it is because 20 minutes is approximately for alcohol to be absorbed into blood from the digestive organs, and residual alcohol remaining in the mouth takes this long to dissipate. For accurate result, do not repeat next testing within 3 minutes after last time. Do not smoke and eat for 20 minutes prior testing.Do not use chemicals to clean the tester directly.Do not blowing liquid into the breath pipe.Do not use any excitant substances near the tester, such as paint, insecticides, alcohol.Do not place the tester in the closed environment with contaminated air. Modifying or tampering with the unit's internal components may cause a malfunction. The unit is designed to be used as an aid to promote reasonable driving. It should not be used in anticipation of the use or operation of vehicles, machinery, or equipment. The unit makes no references whatsoever to blood alc0hol content or other such measures of intoxication promulgated by government,or other agencies or bodies. Product Description: 1. Advanced flat surfaced alcohol sensor 2. Quick response and resume 3. SMD assembling, stable performance 4. MCU control 5. Direct testing process LCD indication, BAC 0.000%, 0.00 %0, mg/l 6. One key operating 7. Digital LCD display with Red backlight 8. 360 degree rotating mouthpiece 9. Portable and fashion design 10. Audio warning beyond pre-set limit 11. Sensor Fault Self checking 12. Battery saved design, low voltage indication.2 x 1.5v AAA alkaline battery(without) Material: plastic colour: As shown Package Contents: 1 x Digital Breath Alcohol Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.