Specification: Sensor: Advanced Flat Surfaced Alcohol Sensor Operating Temperature Range:10oC~50oC Detectionrange: 0.00-0.20BAC%; 0.00-2.00g/L;0.00-2.00BAC?; 0.00-1.00mg/L;0.00-200mg/100mL Alarming Level: 0.05BAC%; 0.50g/L; 0.50BAC?;0.25mg/L; 50mg/100mL Power: 3 X AAA Battery (Not Included) Accuracy: ?R10% F.S Working Voltage: DC4.5V(3xAAA)Batteries Working Current: RelativeHumidity: 95% No Dews How To Use: 1.Open The Battery Cover, And Then Put The 3 AAA Batteries Into The Tester According To Polarity. 2.Press The "Start" Button, Accompanied By A Short Beep, Backlit, While The Screen Displays A Countdown From 100 To 000, The Lower Part Of The Screen Displays The Word "WAIT", Preheat The Program Prompts The Machine Running, Then Please Do Not Blow Otherwise It Will Affect Test Accuracy. Preheating Is Completed, "WAIT" Disappears, The Detector Beep While Displaying The Words "BLOW", "C" Letter Swim Show, Then You Can Start The Next Breath Alcohol Content Test Gas. 3.Please Take A Deep Breathing, Alignment On The Screen When The "C" Letter Swim Native Display Continuous And Uniform Blowing Mouthpiece Until The Machine Beep, Stop Blowing. 4.Blow Over, Swim Screen Displays "" Symbol, Also Shows "The Word TEST", Prompts Are Analyzing The Test Results, This Time Not Blowing, Otherwise It Will Affect The Test Results. After Analyzing The Concentration Value Displayed On The Screen Is The Testers Exhaled Alcohol Content, The Value Remains For A Few Seconds After, The Machine Automatically Shut Down. Tips For Alcohol Test: 1.Please Wait For 20 Mins After Drinking,Then Blow To It. Otherwise,It Has No Reaction. 2.If Another Person Want To Test After You,He/She Should Wait For 5 Mins. Package Content : 1x Breath Alcohol Tester 5 X Mouthpieces ?lHigh Accuracy?zSensitive Semiconductor Sensor Accurately Display Alcohol Content Within Seconds; The Tester Can Detect Trace Amounts Of A