[Non-contact Test,More Sanitary]--No need to contact nozzle to blow for getting the test result, upgrade breathalyser allows you to blow in front of the testing area,getting more precise testing result and ensuring the sanitary at same time.Note, please turn on the breathalyser 10s before use, blowing period should be no less than 4s.[High Precision]-- Built-in high accurate IC chips and precision intelligent sensors, more accurate measurement. The alcohol tester adopts precision 4.0 algorithm to eliminate impurities and accurately test the alcohol content. The accuracy is up to 0.005% BAC.Testing range is 0.00-0.19%BAC, quick responce within 5s.[LCD Digital Display & 3 Color Indicator]--Equipped with LCD digital display screen, easy to read. With three indicator, green is for clear, yellow is for warning,red is for drunk.[Sound Alarm]--Once you are judged as drunk state,the built in buzzer will alarm automatically when the alcohol content exceeds the standard value.[USB Charging]--The built-in 140mAh battery ,USB charging,can be powered by powerbank or connecting any adapter. Compact and convenient to carry.