feature:The digital alcohol tester has an audible alarm.LCD backlit display, easy to read.Quick response and recovery.Detection range: 0.00%-0.19% BAC (0.0-1.9g/l).Automatic shut-down.Small keychain, light weight and easy to carry.Powered by 2 AAA batteries. (not include)Product specifications:Colour: BlackSensor: Advanced semiconductor oxide alcohol sensorDetection range: 0.00%-0.19% BAC (0.0-1.9g/l)Accuracy: +/- 0.01% BAC (0.1g/l)Warm-up time: within 10 secondsResponse time: within 5 secondsWorking temperature: 10~40Ambient temperature: 40%~90%Power supply: 2 AAA batteries (not included)Item size: about 11.8 * 7 * 2.8cm / 4.6 * 2.7 * 1.1inItem weight: about 52 gramsPackage Included:1 * Breath Alcohol Tester4 * mouthpiece1*English manual