1. Advanced semiconductor sensors feature high sensitivity, rapid response, and simple and convenient operation. 2. It can display the final test results in both digital and cartoon modes, and it is suitable for anyone to use for self - testing. 3. The test results are classified into five grades: excellent, normal, fair, poor, and very poor. 4. The digital LCD screen is paired with orange - backlit cartoon patterns. It is energy - saving and environmentally friendly, with soft colors that are less likely to harm the eyes. 5. It has a rapid response and self - testing function, and can display different conditions. 6. It has a portable design, with a small size and compact structure, making it easy to put in a pocket and carry around. 7. It has a non - contact design. One can exhale at a distance of 5 - 10 millimeters from the detector, which is more hygienic. 8. It has an energy - saving design with a low - battery indicator. It uses 2 AAA batteries and has a relatively long lifespan (batteries are not included). **Usage Method**: 1. Open the battery compartment, insert 2 AAA batteries, and then close the battery compartment. 2. Press the power button, and a 9 - second countdown will be displayed. 3. Then the screen will flash "C". At this time, one can exhale evenly at the air inlet for 3 seconds. 4. After hearing the beep, the test result will be displayed. The result will be shown for 5 seconds and then the device will automatically shut down. 5. If one wants to conduct another test, simply press the power button again. **Specifications**: 1. Sensor type: Semiconductor sensor 2. Pre - heating time: 9 seconds 3. Exhalation time: 5 seconds 4. Operating environment: Relative humidity ≤ 95%, no condensation 5. Power supply: 2 AAA batteries (not included) 6. Product dimensions: 95 x 36 x 18 mm / 3.74 x 1.42 x 0.71 inches 7. Color: White 8. Material: Plastic **Package Contents**: 1. 1 Halitosis detector (without batteries) 2. 1 English instruction manual Only the above items are included in the package, and other products are not included. **Precautions**: Due to lighting and different monitors, the color of the items in the picture may slightly differ from the actual product. The allowable measurement error is +/- 1 - 3 cm.