Bad breath would make people feel uncomfortable, especially stay with girlfriends or boyfriends face to face together, how to avoids embarrassing scene You should try this odor breath tester It will help you to know your oral odor condition Odor breath tester is specially designed to check peoples breath quality. You can have a try.Usage:Open the battery box, put into 2 * AA battery and close the box.Press the POWER button, there will display 9 seconds count down.Then the display will flash C, and right now you can breathe out 3 seconds evenly to the air intake.After one beep sound, it will display the result, the result will display 5 seconds, and shut off automatically.If you want to test one more time, just press the Power button again.Specifications:Sensor type: semiconductor sensorWarm up time: 9sBlowing time: 5sWorking environment: relative humidity: 95% no dewsPower: 2 * AAA batteries (not included)Item size: 95 * 36 * 18mm / 3.74 * 1.42 * 0.71inItem weight: 36.6g / 1.29ouncePackage size: 100 * 50 * 30mm / 3.94 * 1.97 * 1.18inPackage weight: 45g / 1.59ouncePackage list:1 * Breath Tester1 * Manual