1. ### Functional Features 1. It uses advanced semiconductor sensors, with features of high sensitivity, rapid response, and is relatively simple and convenient to use. 2. The final test results are presented in both digital and cartoon modes, allowing most people to use the tester for detection. 3. There are 5 result levels: Excellent, Normal, Good, Poor, and Very Poor. 4. It is equipped with a digital liquid - crystal display with orange backlight and cartoon indicators, which is considered energy - saving and environmentally friendly. The colors are soft and generally will not harm the eyes. 5. It has relatively fast response and recovery speeds, and comes with a self - testing function to show different states. 2. ### Technical Parameters 1. Sensor type: Semiconductor sensor 2. Heating time: 9 seconds 3. Blowing time: 5 seconds 4. Working 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 3. ### Precautions 1. Due to manual measurement, an error of 0 - 1 cm is acceptable. Please confirm that you can tolerate this error before purchasing. 2. Due to differences between different displays, the pictures may not exactly represent the actual color of the product. Please understand. 4. ### Package Contents 1 breath odor tester