Note:Please test after drinking for at least 20 minutes because it takes about 20 minutes for the alcohol to be absorbed from the digestive into the bloodstream. If testing immediately, it can only reflect the alcohol concentration in the oral cavity, not in the blood.If it is not used for the first time or for a long time, please turn on the machine and preheat it several times, because there will be oxides on the surface of the sensor to ensure the accuracy of the inspection results.Specification:Color: Black/SilverMaterial: ABSTimes of Full Power Use: 300 TimesSize: About 10x2.7x1.4cm/3.94x1.06x0.55inFeatute:- LED Display,Make it much easier for the night display and give you professional accuracy for safe driving.- 3 Detection Indicators,Green: Safety, Orange: Caution, Red: Danger.- High-Precision,high-sensing chip, more accurate measurement.- Scientific filter design,Take out the air and leave only alcohol. The accuracy of the measurement is very high.Operation Steps:1.Power ON: Slide the switch down to turn on.2.Warm Up: When the degree is returned to 0, the preheating is completed.3.Blow: Blow at the tuyere with moderate force for 3-5 seconds.4.Result:The results of alcohol concentration are displayed, and the corresponding concentration indicator is on.5.Power OFF : Slide the switch up to shut down.Note:-Due to the light and screen difference, the item's colormaybe slightly different from the pictures. Please understand.-Please allow 0.5-1 inch difference due to manualmeasurement.(1inch=2.54cm).Package Included:1 x Alcohol Detector1 x USB cable