Features: Safe and Easy to Use: blow for 3~5 seconds near the detector blow port, then wait for a few seconds, the test will display. No contacting detection is . Testing Indication: if the is 0.02%~0.05BAC(0.2~0.5g/l), it will display Caution on the screen, if the is 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 also can be switched between g/l and mg/ml. Useful Breathalyzer: it has design and portable size, the advanced sensor ensures the accuracy of the measurement, convenient to use. Power Saving Auto-off: after the detection 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. Specifications: Color: blue Material: ABS 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 Item Size: 185 x 43 x 25mm / 7.28 x 1.69 x 0.98in Item Weight: 70g / 2.47oz Package Contents: 1 x Tester 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.