Safe and Easy to Use: blow for 3-5 seconds near the detector blow port, then wait for a few seconds, the test result will display. No contacting detection is . Testing Result Indication: if the result is 0.02%-0.05BAC(0.2-0.5g/l), it will display Caution on the screen, if the result is equal 0.05%BAC(0.5g/l), the screen will display Danger, and sound and light alarm. Professional Alcohol Tester: 0.00%-0.19%BAC(0.0-1.9g/l) detecting range, 0.01%BAC accuracy, the test result also can be switched between g/l and mg/ml. Useful Breathalyzer: it has compact design and portable size, the advanced sensor ensures the accuracy of the measurement, very convenient to use. Power Saving Auto-off: after the detection result is displayed for 10 seconds, the tester will shut down automatically. Low Power Consumption: built-in with 500mAh lithium battery, easy to be recharged via the USB cable. Display :LCD screen display Atmospheric Pressure:86-106kPa Alcohol Sensor Type:Semiconductor sensor Detection Range:0.0-1.9g/l & 0.00%-0.19%BAC Accuracy:0.01%BAC Response Time:3-10 seconds Warm-up Time:10s Charging:5V DC USB Battery:500mAh lithium battery Colour:Blue Material:ABS Size:185x43x25mm/7.28x1.69x0.98in Package Contents: 1 * Tester 1 * USB Charging Cable 1 * English Manual Only the above package content, other products are not included. Note: Light reflection 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.