Advanced semiconductor sensor with fine sensitivity and quick response, simple and convenient to use. Displays the final test result in digital and icon mode, allowing anyone to perform self-checks. Features 5 result levels: very good, normal, not very good, bad, very bad. Digital LCD display with orange backlight, energy-saving and environmentally friendly, designed with soft colors to reduce eye strain. Fast response time with self-check function to indicate different conditions. Portable design, compact size and lightweight, 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 extended use (batteries not included). Instructions: Open the battery compartment and insert 2 x AAA batteries, then 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 powers off. To repeat the test, press the power button again. Specifications: Sensor type: Semiconductor sensor Warm-up time: 9 seconds Breathing time: 3 seconds 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: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowed: +/- 1-3cm.