Description: High sensitivity semiconductor alcohol sensor. One-key operation, automatic shutdown, power saving. Digital blue backlit LCD display. Intelligent MCU control. Quick response and recovery function. Automatic sound alarm-portable design. Specification: Size: 108x50x30mm/4.25x2x1.2 inch Sensor: Advanced semiconductor oxide alcohol sensor Test range: 0.00-019% BAC (0.0-1.9g/l) Working temperature: 5 to 45C Accuracy: -0.01% + 0.02% BAC Alarm threshold: 0.50% BAC Power input: 2x1.5V "AAA" alkaline batteries (not included) Response time:<5s Working time: 10s Warm up: 10 seconds Automatic power off: 10 seconds after the result is displayed Package Includes: 1 X Breath alcohol tester (not include batteries) 1 X Manual 4 X Replaceable nozzles Note: 1.Press the power switch for 2 seconds to turn on the machine 2.Machine self-checks and "warm up" for 10 seconds 3.Take a deep breath and blow at the breath for 10 seconds 4.Get accurate results, there will be different colors of lights and prompt sounds, the machine will automatically power offafter use In order to make the test results accurately, please test with the alcohol breathalyzer 25 minutes later after drinking; please wait for another 10 minutes before starting the next test to get the precise testing result