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 displayAtmospheric Pressure:86-106kPaAlcohol Sensor Type:Semiconductor sensorDetection Range:0.0-1.9g/l & 0.00%-0.19%BACAccuracy:0.01%BACResponse Time:3-10 secondsWarm-up Time:10sCharging:5V DC USBBattery:500mAh lithium batteryColour:BlueMaterial:ABSSize:185x43x25mm/7.28x1.69x0.98inPackage Contents:1 * Tester1 * USB Charging Cable1 * English ManualOnly 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.