Specification:Item Type: USB BreathalyzerMaterial: ABSSensor Type: Semiconductor Type SensorDisplay: LCD (Black and White)Test Range: 0.00 to 0.199%BAC(0 to 0.999mg/l)Measurement Unit: mg/l)BrAC) mg/ml(BAC)Measurement Mode: Quick Check, Automatic DetectionBattery: Lithium Battery 140mAh (included)Use Time: 150 Times of Continuous Wine TestingVoltage: 5VWorking Temperature: 0 to 45℃Warm up Time: 10 SecondsBlowing Time: within 10 Seconds, More Than 4 Seconds RequiredResponse Time: Less Than 5 SecondsCurrent: 1AWeight: Approx. 48g / 1.7ozHow to Use:1. Press the button for 1 second to turn it on, the backlight and the display will light up at the same time, display all the content and a beep prompt to turn on.2. The display shows Warm up and a 10 second countdown. After the countdown is over, a beep will sound, indicating that it will enter the following stage at the same time.3. The display shows Blow and a 10 second countdown. Blow to the blowing place for 3 to 5 seconds. After the countdown is over, a beep sound will prompt you to enter the result display. The test result is displayed in two units of %BAC and g/l. .4. When the test result is less than 0.02% BAC, the green indicator light is always on.5. When the test result is greater than or equal to 0.02%ABC and less than 0.05%BAC, the yellow indicator light is always on, the Caution icon on the display screen flashes, and there is a slow beep sound.6. When the test result is greater than or equal to 0.05% BAC, the red indicator light is always on, the Danger icon on the display screen is flashing, and there is a rapid beep sound. The test results show a time of 10 seconds.Package List:1 x USB Breathalyzer1 x User Manual1 x USB Power CableNote:Ships with built in battery.