Features: brand new and high quality High precision,this alcohol tester adopted high-precision alcohol sensor, just need only 5 seconds can give a result to judge whether you can drive or not. Easy to use,just press the power button for 2 seconds to start the professional breathalyzer, wait 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 15 seconds. 6 Replaceable mouthpieces, this alcohol tester comes with 6 replaceable mouthpieces, you don'for t have to worry about forgetting to take mouthpiece when you are out. Portable design, this professional alcohol breathalyzer just need small space, can be easily carried in your wallet or pocket everywhere.great for wedding, parties, feast or other social activities, ensures your safe driving after drinking. Alarming level is :0.050% Bac or 0.500 Bac ,0.5g/l;0.25mg/l . and the measurement range of each unit is 00.20Bac ,0~2.00 Bac ,02.00g / L,01.00mg / L,acquiescence is (0~2.00Bac ). Specifications: Material:ABS Color:Black,White Measure Range: 00.20Bac ,0~2.00 Bac ,02.00g / L,01.00mg / L Acquiescence is :(0~2.00Bac ) Alarming level:0.050% Bac ; 0.500 Bac ;0.5g/l;0.25mg/l Accuracy:0.01% Bac ;0.01 Bac ;0.05mg/l Battery:21.5V(AA Battery) Current consumption:Working Current 180MA Note: Please allow 1-2cm errors due to manual measurement. Due to the difference betweeen different monitors,the pic may not reflect the actual color of the item. Package includes: 1 Set Alcohol Tester Include: 1 Piece Alcohol Tester(without battery) 6 Pieces Disposable Mouthpieces