2020 newest breath alcohol tester professional Breathalyzer With LCD Screen Digital Alcohol Detector Powered By USB Charger Features: 1.The newly upgraded portable alcohol tester uses advanced aviation-grade semiconductor materials and a new C+ language calculation method to make the test results more accurate and the test results of 2 units cleare 2.Lower than warning value: Make a "di" sound and the light will turn green. 3.Between warning value and dangerous value: Make sound as "di di" and the light will turn yellow. 4.Higher than dangerous value: Make sound as "di di di..." for about 10 seconds. The light will turn red 5.This alcohol tester is suitable for family gatherings, dating and friends gatherings. Specifications: Colour: Black Note: The product needs to be pressed for a long time to work normally. If it is pressed briefly for one second, it will not boot normally, but it is normal, please don't worry. Package included: 1*Box 1*Instruction 1*USB data cable 1*Alcohol Tester