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. 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 red 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 result 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 Best Gift The most intimate gifts for friends and relatives, such as birthday gifts, Christmas gifts, Mother's Day gifts, Father's Day gifts, and adult gifts. The package contains 1*Instruction 1*USB data cable 1*Alcohol Tester Question: No matter how much alcohol you drink, the tester always shows the same value of 0.13. Why? Answer: Because 0.13 is already a drunk driving, no matter how large the value is, it is meaningless, so when designing --- the maximum value is 0.13. This phenomenon is normal.