SincereetaliFeatures: High accuracy: This alcohol detector has a highly sensitive semiconductor alcohol sensor, which can quickly give a result in 5 seconds to determine whether you can drive or not. Backlit display screen: Blue backlit LCD screen, the numbers are clear and easy to read, and you can see clearly at night. Three unit conversion: %BAC / BAC / mg/L three units of alcohol measurement can be converted. Easy to Use: Just press the power switch for 3-5 seconds to start the professional breathalyzer, wait for 15 seconds to warm up, then blow with the tester for 5-6 seconds, the result will come out after 3 seconds and display on the LCD screen for 15 seconds. 20 Interchangeable Mouthpieces: This breathalyzer comes with 20 interchangeable mouthpieces, you don't have to worry about forgetting to bring mouthpieces when you are on the go. Portable Design: This breathalyzer is easy to hold and carry, and the white cloth pouch is convenient enough for you to take it with you anytime and anywhere to ensure safe driving after drinking. Features: Color: Black Material: ABS Test Range: 0.000-0.199% BAC;0.000-1.990BAC;0.000-0.995mg\L Alarm Point: 0.050% BAC;0.500BAC;0.25mg\L(BrAC) Accuracy: 0.01% BAC; 0.10? BAC; 0.05?mg\L Reaction time: