Advanced semiconductor sensor,with fine sensitivity and quick accountability,simple and convenient to use.It will show the final test in digital and mode,anyone can check themselves by this tester.5 levels: very good,normal,not very good,bad,very bad.Digital LCD display and with orange backlight,save energy and environmental protection,with calming colors and will not hurt your eyes.Quick response and cv,with -check to show different conditions.Portable design,small size with compact structure,easy to put in your pocket and carry with you.Non-contact design,5-10mm from the detector,more .Battery saving design,low battery indication,2 x AAA batteries long service life (battery is not included).Use: Open the battery case,put into 2 * AA battery and the case.Press the power button,it will display 9 seconds countdown.Then the screen flashes "C",and at this moment you can 3 seconds evenly at the air inlet.After a beep sound,it will display the ,the will display 5 seconds and automatically shut off.If you to test time,press the power button again.Specifications: Sensor type: semiconductor sensorWarm-up time: 9sBlowing time: 5sWorking environment: relative humidity: less than or to 95% no dewsPower: 2 AAA batteries (not included)Item size: 95 x 36 x 18mm / 3.74 x 1.42 x 0.71inColour: whiteMaterial: plastic Contents: 1 x bad breath detector (without battery)1 x English instructionOnly the above content,other are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.