High Accuracy And Easy To ReadSensitive semiconductor sensor accurately display alcohol content within seconds.With a wide LCD backlight display, easy to read.Feature:- High Accuracy & Digital LCD Display: This breathalyzer with sensitive semi-conductor sensor, can accurately display your level of the alcohol content in your body within seconds and provide you test result(up to 0.01mg/l). And you can easily read the result at night with Red back-light .- Automatic Alarm Calculation: This professional alcohol tester will send out audio warning to alarm you when the test result is above 0.50 per mille BAC.- Portable and Easy To Use: Adopt a space-saving, lightweight, portable design, only pocket-size, completely easy to hold and carry everywhere. And you can change the units of measurement and set custom BAC thresholds for testing as needed.- Energy Saving: The alcohol breathalyzer will shut off automatically 5 seconds after the test is completed to save power. In addition, it can show the level of battery ( NOT included batteries).Easy To UseStep 1. Fully charged the alcohol tester and turn on with one button.Step 2. When it's flashing, please wait for 15 seconds.Step 3. ''BLOW'' appears with a beep sound, and then start to blow.Step 4. Review the results.Warm Tips:1.If you haven't used it for 15 days, please open it 3 times before using it next time.2.Do not drink or eat for 20 minutes before the test.3.Please blow within 10 seconds after warm up for 15 seconds.4.Please blow evenly to avoid saliva entering the breathalyzer, causing damage to the alcohol tester.5. Please blow 3 times in a row and take the median to obtain accurate test results. The results are only for reference and should not be considered as reasons for drinking and driving.Note:1. There may be slight size deviations due to manual measurement, different measuring methods and tools.2. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor.Included:1 X Breathalyzer1 X Manual