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Features:Advanced flat surfaced alcohol sensor.Quick response.SMD assembling， stable performance.Direct testing process LCD indication.Digital LCD display with blue backlight.Portable and fashion design.Audible warning beyond preset limit.Sensor fault self checking.Battery saved design， low voltage indication.Digital LCD display.Specifications:Type: Alcohol TesterDetection Range: (0.001.00)mg/L (0.000.20%BAC， 0.002.00g/L)Alarming Threshold: 0.24mg/L (0.05%BAC， 0.5g/L)Test Accuracy: 10% F.SWorking Voltage: DC 4.5V， 3 x AAA Batteries (Not Included)Working Current: 120mAOperating Temperature: -10 to 50/14 to 122Relative Humidity: 93%Display: 3 Digits LCD Display with Blue BacklightBattery Expectancy Time: 60 TimesSize: 10.3cm x 6.5cm x 2.7cm/4.06" x 2.56" x 1.06" (Approx.)Notes:1. After drinking， it is recommended to wait 20 minutes before testing， because alcohol takes about 20 minutes into the blood from the digestive organs， and residual alcohol in the mouth takes time to dissipate .2. To get a more accurate result ， the distance should be at least three minutes between each test .3. Do not use benzene， gasoline and thinners cleaning product ingredients tester .4. Do not allow any liquid penetrated into the sensor.Package Content:1 x Alcohol Tester5 x Mouthpieces1 x User Manual