HAOYI Advanced semiconductor sensor with fine sensitivity and quick response, simple and convenient to use. It displays the final test result in digital and cartoon mode, allowing anyone to check themselves using this tester. 5 result levels: very good, normal, not very good, bad, very bad. Digital LCD display with cartoon icons and orange backlight, energy-saving and environmentally friendly, featuring calming colors that are easy on the eyes. Quick response with self-check function to indicate different conditions. Portable design, compact size and structure, easy to carry in a pocket. Non-contact design – breathe from 5-10mm away from the detector for improved hygiene. Battery-saving design with low battery indicator; powered by 2 x AAA batteries for long service life (batteries not included). Instructions: Open the battery compartment, insert 2 x AAA batteries, and close the compartment. Press the power button; the device will display a 9-second countdown. The screen will flash "C"; at this point, breathe evenly into the air inlet for 3 seconds. After a beep, the result will be displayed for 5 seconds before the device automatically shuts off. To perform another test, press the power button again. Specifications: Sensor type: Semiconductor sensor Warm-up time: 9s Blowing time: 3s Working environment: Relative humidity ≤ 95% RH, no condensation Power supply: 2 x AAA batteries (not included) Item size: 95 x 36 x 18mm / 3.74 x 1.42 x 0.71in Color: White Material: Plastic Package Contents: 1 x Bad breath detector (without battery) 1 x English instruction manual Note: Light and display differences may cause slight color variation between the image and the actual item. Measurement error allowed is +/- 1-3cm.