Product Mini & PortableSmall size, only 10cm in length,easy to carry. Easy To UseSimple one button operation, easy to deal with dark environment at night or drunk state. USB ChargingCan be charged by mobile power / laptop / car, convenient and fast. Sound & Light PromptDi~di, there will be clear beep prompt tone, and 3 colors light prompt, convenient for you to operate and result prompt. Blowing TypeAir blowing, non-contact, hygienic and high precision. Times of Full Power Use300 Times Featute: - 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. Product Usage Introduction 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: - 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. Applicable Scene You can use it for many scenes, like family gathering, business activity, birthday party, and wedding ceremony. Let the alcohol tester protect you and your loved ones can drive safely every time. Package Include 1*Storage bag 1*Box 1*Instruction 1*USB data cable 1*Alcohol Tester