1.HD LED dual screen personal breathalyzer: 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 clearer.2.Sound Warning and Color Distinction: Lower than warning value: Make a di sound and the light will turn green. Between warning value and dangerous value: Make sound as di di and the light will turn yellow. Higher than dangerous value: Make sound as di di di. for about 10 seconds. The light will turn red3.widely used: This alcohol tester is suitable for family gatherings, dating and friends gatherings. The alcohol tester is easy to operate with one touch,Just press the power button for 2 seconds to start the professional breathalyzer, wait for 15 seconds for warming-up, then blow with the tester for 10 seconds, the result will be ready after 3 seconds, and it will be displayed on the LCD screen for 10 seconds.4.Best Gift: The most intimate gifts for friends and relatives, such as birthday gifts, Christmas gifts, Mothers Day gifts, Fathers Day gifts, and adult gifts.NOTE: 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 resultMaterial: plasticcolour: blackPackage Contents:1 x Breathalyzer1 x USB cableOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.