[High Accuracy]- Quickly get an accurate BAC result 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, quick response and recovery. [LCD Display]- Night display and give you professional accuracy for safe driving. [Easy to Use]- Just press the power button for 2 seconds to start theprofessional 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 displays on the LCD screen for 10 seconds. [Portable]- The small size alcohol analyzer, small enough to put in your car, purse, backpack or door -documents, making it easy to take with you wherever you go. This professional breathalyzer only needs a small tit space, can be easily carried in yourwallet 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 0.00~0.99mg\/L 0.00~199mg\/100ml Alert point: 0.05% BAC 0.25mg\/l to 50mg\/100ml Accuracy: 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