[High Accuracy]- Get an accurate blood alcohol result quickly with this electronic breathalyzer to help you judge whether you can drive or not. [Detection Range]- 0.00-0 ,19% BAC(0.0-1.9g/L), fast detection results, fast response and recovery. [LCD Display]- Night display and give you professional accuracy for safe driving. [Easy to Use]- Simply press the power button for 2 seconds to start the professional breathalyzer, wait 10 seconds for warming up, then blow with the tester for 5 seconds, the result will be ready after 3 seconds, and it will be displayed on the LCD screen for 10 seconds. [Portable]- The small size alcohol analyzer, quite small to be stored in your car, purse, backpack or briefcase, making it easy to take with you wherever you go. This professional breathalyzer has no only need a small space, can be easily carried in your wallet or pocket anywhere. Ideal for wedding, parties, feast or other social activities, ensure your safe driving after drinking. 1.Press the power button for 2 seconds to start the professional breathalyzer. 2. Wait 10 seconds to heat up, then blow with the tester for 5 seconds. 3. The result is completed in 3 seconds and displayed on the LCD screen for 10 seconds. Range 0.00 ~ 0.19% BAC 0.00 ~0.95mg/L Warning point: 0.05% BAC 0.25mg/l at 50mg/100ml Precision: 0.01% BAC 0.05mg/L; 10mg / 100ml (At alarm point 0.050% BAC 0.250 mg/L) Package content: 1 x Electronic Breathalyzer 5 x Mouthpieces Mouthpieces