Adopting an easy to read LED display screen, with dual screen display, 2 unit test results, non-contact blowing nozzle, and equipped with USB data cable and keychain design, the DOODBi alcohol tester is compact in size and portable, allowing you and your loved ones to drive safely every time1. High definition LED dual screen personal alcohol testerThe newly upgraded portable alcohol tester adopts advanced aviation grade semiconductor materials and a new C+language calculation method, making the test results more accurate and the test results of 2 units clearer.2. Sound warning and color differentiationBelow warning value: emits a "beep" sound and the light will turn green. Between the warning value and the danger value: make a "beep beep" sound, the light will turn yellow. Above the danger value: emit a "beep beep beep..." sound for about 10 seconds. The light will turn redAttention: To ensure accurate test results, please use an alcohol breath tester to test after drinking for 25 minutes; Please wait for another 10 minutes before starting the next test to obtain accurate test results3. Widely usedThis alcohol tester is suitable for family gatherings, dates, and friend gatherings. The alcohol tester is easy to operate with just one click. Simply press the power button for 2 seconds to start the professional alcohol tester. Wait for 15 seconds for preheating, then use the tester to blow air for 10 seconds. The results will be ready after 3 seconds and displayed on the LCD screen for 10 seconds.4. The Best GiftThe most thoughtful gifts for family and friends, such as birthday gifts, Christmas gifts, Mother's Day gifts, Father's Day gifts, and adult gifts.5. The packaging includes 1 * alcohol tester+1 * box+1 * instruction manual+1 * USB data cable