Precise alcohol consumption result， with a 0.00-0.19% BAC & 0.0-1.9g/l test range.Easy to know your alcohol consumption after drank， avoids drunken driving problem.Super simple to operate: Breathe on the tester， 5 seconds later， you can know the result.Small design， easy to carry.Red LED backlight， show you the result clearly even in the dark.Type: Alcohol TesterColor: BlackVoltage: 3VDisplay: DigitalBacklight: RedWarm-up/Response Time: within 10/5SMeasurement Accuracy: 99.9%Resolution Ratio: 99%Operating Temperature: 5-40Detection Range: 0.00~0.19%BAC/0.0~0.05%g/lPowered by: 2 x AAA Batteries (Not Included)Dimension: 11.8cm x 7cm x 2.8cm/4.65" x 2.76" x 1.10" (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 Includes:1 x Digital LCD Alcohol Tester (Batteries are not included.)1 x English ManualAmazing shopping. You deserve great items.