Features 【3 Measurement Units】There Are 3 Units to Choose From, %Bac, Bac, Mg/L, If You Drink Alcohol, It Is Recommended to Wait for 20 Minutes Before Taking The Test, Because The Alcoholic Blood Needs 20 Minutes to Digest The Organs. Please Wait At Least 3 Minutes after The Last Test Before Starting The another Test. 【Energy Saving & Durable】Professional Grade Reliability, Powered By 3 X 1.5v Aaa (Not Included) Batteries, You Don'T Need to Worry About Charging This Device. The Device Has A Long Battery Life And Automatic Power Off to Help You When You Need It Most. 【Easy To Use】Just Press And Hold The Power Button for 1 Second To Start The Alcohol Breath Analyzer Tester, Wait for 10 Seconds To Warm Up, And Then Keep Blowing for 5-10 Seconds to Get The Result. The Blue Backlit Lcd Display Allows You to Clearly See The Value. 【Lightweight And Convenient】This Alcohol Breath Tester Is Space-Saving, Lightweight And Easy to Hold Hold And Carry. The Compact Shape Allows You to Carry It With You Anytime, Anywhere to Ensure The Safety of Drunk Driving 【5 Mouthpieces】Professional Airway Design, 5 Different Mouthpieces For Yourself, Friends And Family to Test. The Material Abs Is Safer to Use. Our Breathing analyzers Meet The High Standards of Roadside Law Enforcement, Hospital Employees And Professionals. Specification: Item Type: Alcohol Breath Tester Material: ABS 1. Professional airway design 2. Blue backlit LCD display 3. 3 test units optional for users 4. Automatic power saving shutdown function 5. Preheating Time: <20S, Reaction Time: <5S 6. Measuring Range: 0.000-0.199% BAC, 0.000-1.990‰ BAC and 0.000-0.995 mg/L(BrAC) 7. Battery: 3 x 1.5V AAA(not included) Package List: 1 x Host 5 x Mouthpiece 1 x Mouthpiece Slot 1 x User Manual Package List 1 x Host 5 x Mouthpiece 1 x Mouthpiece Slot 1 x User Manual